diff --git a/HeavenClient/Character/Inventory/Inventory.cpp b/HeavenClient/Character/Inventory/Inventory.cpp
index 0b79e2072..6886bf225 100644
--- a/HeavenClient/Character/Inventory/Inventory.cpp
+++ b/HeavenClient/Character/Inventory/Inventory.cpp
@@ -321,6 +321,18 @@ namespace ms
 		}
 	}
 
+	int16_t Inventory::equip_position(int16_t slot, EquipSlot::Id part) const
+	{
+		return get_cash_id(InventoryType::Id::EQUIP, slot) ? part + CASH_EQUIP : part;
+	}
+
+	int16_t Inventory::shown_equip(EquipSlot::Id part) const
+	{
+		int16_t cash = part + CASH_EQUIP;
+
+		return inventories[InventoryType::Id::EQUIPPED].count(cash) ? cash : part;
+	}
+
 	int16_t Inventory::find_free_slot(InventoryType::Id type) const
 	{
 		int16_t counter = 1;
diff --git a/HeavenClient/Character/Inventory/Inventory.h b/HeavenClient/Character/Inventory/Inventory.h
index c32d20735..f20cb2da9 100644
--- a/HeavenClient/Character/Inventory/Inventory.h
+++ b/HeavenClient/Character/Inventory/Inventory.h
@@ -57,6 +57,9 @@ namespace ms
 			ADDCOUNT
 		};
 
+		// How far above its slot a cash item is worn.
+		static constexpr int16_t CASH_EQUIP = 100;
+
 		// Return the move type by value
 		static Movement movementbyvalue(int8_t value);
 
@@ -121,6 +124,15 @@ namespace ms
 		// Find a free slot for the specified equip.
 		EquipSlot::Id find_equipslot(int32_t itemid) const;
 
+		// The worn position for the equip in Equip tab `slot` at `part`. Like
+		// v83 (FUN_004f2cbb), an item with a Cash Shop serial is worn 100
+		// above its slot, over whatever regular item is there.
+		int16_t equip_position(int16_t slot, EquipSlot::Id part) const;
+
+		// The worn position whose item is shown at `part`: the cash item's
+		// if there is one (FUN_007fec81), else the regular one's.
+		int16_t shown_equip(EquipSlot::Id part) const;
+
 		// Find a free slot in the specified inventory.
 		int16_t find_free_slot(InventoryType::Id type) const;
 
diff --git a/HeavenClient/Character/Player.cpp b/HeavenClient/Character/Player.cpp
index e2906a7f2..47e50f82c 100644
--- a/HeavenClient/Character/Player.cpp
+++ b/HeavenClient/Character/Player.cpp
@@ -193,10 +193,19 @@ namespace ms
 
 	void Player::change_equip(int16_t slot)
 	{
-		if (int32_t itemid = inventory.get_item_id(InventoryType::Id::EQUIPPED, slot))
+		EquipSlot::Id part = EquipSlot::by_id(slot % Inventory::CASH_EQUIP);
+
+		if (part == EquipSlot::Id::NONE)
+			return;
+
+		// The look wears a cash item over the regular one, but has no cash
+		// weapons (v83 draws them over the regular weapon's stances).
+		int16_t shown = part == EquipSlot::Id::WEAPON ? part : inventory.shown_equip(part);
+
+		if (int32_t itemid = inventory.get_item_id(InventoryType::Id::EQUIPPED, shown))
 			look.add_equip(itemid);
 		else
-			look.remove_equip(EquipSlot::by_id(slot));
+			look.remove_equip(part);
 	}
 
 	void Player::use_item(int32_t itemid)
diff --git a/HeavenClient/IO/UI.cpp b/HeavenClient/IO/UI.cpp
index eb590892b..b7e6a8763 100644
--- a/HeavenClient/IO/UI.cpp
+++ b/HeavenClient/IO/UI.cpp
@@ -129,7 +129,7 @@ namespace ms
 			Music::set_bgmvolume(Music::configured_volume());
 
 			// v83 checks the balances on coming back to the Cash Shop.
-			if (get_element<UICashShop>())
+			if (auto cashshop = get_element<UICashShop>(); cashshop && cashshop->request())
 				CheckCashPacket().dispatch();
 		} else
 		{
diff --git a/HeavenClient/IO/UIStateCashShop.cpp b/HeavenClient/IO/UIStateCashShop.cpp
index 21656ad17..a3fbc0f47 100644
--- a/HeavenClient/IO/UIStateCashShop.cpp
+++ b/HeavenClient/IO/UIStateCashShop.cpp
@@ -90,26 +90,20 @@ namespace ms
 
 				return focusedelement->send_cursor(clicked, cursorpos);
 			}
-			else
-			{
-				focused = UIElement::NONE;
 
-				return cursorstate;
-			}
+			// A closed dialog lets the window under it have the cursor at
+			// once, or the first click after it would find no button hovered.
+			focused = UIElement::NONE;
 		}
-		else
+
+		if (auto front = get_front())
 		{
-			if (auto front = get_front())
-			{
-				remove_cursor(front->get_type());
+			remove_cursor(front->get_type());
 
-				return front->send_cursor(clicked, cursorpos);
-			}
-			else
-			{
-				return Cursor::State::IDLE;
-			}
+			return front->send_cursor(clicked, cursorpos);
 		}
+
+		return Cursor::State::IDLE;
 	}
 
 	UIState::Iterator UIStateCashShop::pre_add(UIElement::Type type, bool toggled, bool is_focused)
diff --git a/HeavenClient/IO/UITypes/UICashBuy.cpp b/HeavenClient/IO/UITypes/UICashBuy.cpp
index 480359282..2cf87844b 100644
--- a/HeavenClient/IO/UITypes/UICashBuy.cpp
+++ b/HeavenClient/IO/UITypes/UICashBuy.cpp
@@ -16,8 +16,10 @@
 //	along with this program.  If not, see <https://www.gnu.org/licenses/>.		//
 //////////////////////////////////////////////////////////////////////////////////
 #include "UICashBuy.h"
+#include "UICashShop.h"
 
 #include "../KeyAction.h"
+#include "../UI.h"
 
 #include "../Components/MapleButton.h"
 
@@ -164,15 +166,19 @@ namespace ms
 	void UICashBuy::buy()
 	{
 		CashType cash_type = PAYMENTS[payment];
+		auto cashshop = UI::get().get_element<UICashShop>();
 
-		if (is_package(item_id))
-			BuyCashPackagePacket(cash_type, sn).dispatch();
-		else if (is_expansion(item_id) && sn == 0)
-			ExpandSlotsPacket(cash_type, expanded(item_id)).dispatch();
-		else if (is_expansion(item_id))
-			ExpandSlotsPacket(cash_type, expanded(item_id), sn).dispatch();
-		else
-			BuyCashItemPacket(cash_type, sn).dispatch();
+		if (cashshop && cashshop->request())
+		{
+			if (is_package(item_id))
+				BuyCashPackagePacket(cash_type, sn).dispatch();
+			else if (is_expansion(item_id) && sn == 0)
+				ExpandSlotsPacket(cash_type, expanded(item_id)).dispatch();
+			else if (is_expansion(item_id))
+				ExpandSlotsPacket(cash_type, expanded(item_id), sn).dispatch();
+			else
+				BuyCashItemPacket(cash_type, sn).dispatch();
+		}
 
 		deactivate();
 	}
diff --git a/HeavenClient/IO/UITypes/UICashGift.cpp b/HeavenClient/IO/UITypes/UICashGift.cpp
index 1008f52f9..6a875d9af 100644
--- a/HeavenClient/IO/UITypes/UICashGift.cpp
+++ b/HeavenClient/IO/UITypes/UICashGift.cpp
@@ -16,6 +16,7 @@
 //	along with this program.  If not, see <https://www.gnu.org/licenses/>.		//
 //////////////////////////////////////////////////////////////////////////////////
 #include "UICashGift.h"
+#include "UICashShop.h"
 
 #include "../KeyAction.h"
 #include "../UI.h"
@@ -181,7 +182,9 @@ namespace ms
 		if (asking_birthday)
 		{
 			// The server answers a wrong code with its own notice.
-			GiftCashItemPacket(birthday_code(birthday.get_text()), sn, to.get_text(), message.get_text()).dispatch();
+			if (auto cashshop = UI::get().get_element<UICashShop>(); cashshop && cashshop->request())
+				GiftCashItemPacket(birthday_code(birthday.get_text()), sn, to.get_text(), message.get_text()).dispatch();
+
 			close();
 
 			return;
diff --git a/HeavenClient/IO/UITypes/UICashShop.cpp b/HeavenClient/IO/UITypes/UICashShop.cpp
index a2930c5a5..7d7d91142 100644
--- a/HeavenClient/IO/UITypes/UICashShop.cpp
+++ b/HeavenClient/IO/UITypes/UICashShop.cpp
@@ -96,7 +96,7 @@ namespace ms
 		}
 	}
 
-	UICashShop::UICashShop() : tab(EVENT_TAB), subtab(0), page(0), preview_index(0), female(false), credit(0), points(0), prepaid(0), cash_row(0), item_tab(InventoryType::Id::EQUIP), item_row(0)
+	UICashShop::UICashShop() : tab(EVENT_TAB), subtab(0), page(0), preview_index(0), female(false), credit(0), points(0), prepaid(0), pending(false), cash_row(0), item_tab(InventoryType::Id::EQUIP), item_row(0)
 	{
 		nl::node CashShop = NxFiles::ui_classic["CashShop.img"];
 		nl::node Base = CashShop["Base"];
@@ -430,7 +430,8 @@ namespace ms
 			return Button::State::NORMAL;
 		}
 		case Buttons::BT_CHECK:
-			CheckCashPacket().dispatch();
+			if (request())
+				CheckCashPacket().dispatch();
 
 			return Button::State::NORMAL;
 		default:
@@ -448,18 +449,21 @@ namespace ms
 			{
 				const Commodity& commodity = listed[index];
 
-				if (remove)
+				if (pending)
+					return Button::State::NORMAL;
+
+				if (remove && request())
 					SetWishListPacket(unwish(wish_list, commodity.sn)).dispatch();
 				else if (list_button % 3 == 0)
 					UI::get().emplace<UICashBuy>(commodity, credit, points, prepaid);
 				else if (list_button % 3 == 1)
 					UI::get().emplace<UICashGift>(commodity);
-				else if (list_button % 3 == 2)
+				else if (list_button % 3 == 2 && request())
 					SetWishListPacket(wish(wish_list, commodity.sn)).dispatch();
 			}
 		}
 
-		if (buttonid >= Buttons::BT_EX_EQUIP && buttonid <= Buttons::BT_EX_TRUNK)
+		if (buttonid >= Buttons::BT_EX_EQUIP && buttonid <= Buttons::BT_EX_TRUNK && !pending)
 		{
 			// Four slots for 4,000 NX, shown as the expansion item: 9111000
 			// to 9114000 for the bags, 9110000 for the storage.
@@ -585,7 +589,8 @@ namespace ms
 			InventoryType::Id type = InventoryType::by_item_id(item.item_id);
 
 			// The server picks another slot, or refuses, if this one is taken.
-			TakeOutCashItemPacket(item.cash_id, type, inventory.find_free_slot(type)).dispatch();
+			if (request())
+				TakeOutCashItemPacket(item.cash_id, type, inventory.find_free_slot(type)).dispatch();
 			return;
 		}
 
@@ -595,11 +600,26 @@ namespace ms
 		{
 			int16_t slot = static_cast<int16_t>(item_row * ITEM_COLUMNS + item_cell + 1);
 
-			if (int64_t cash_id = inventory.get_cash_id(item_tab, slot))
+			if (int64_t cash_id = inventory.get_cash_id(item_tab, slot); cash_id && request())
 				PutBackCashItemPacket(cash_id, item_tab).dispatch();
 		}
 	}
 
+	bool UICashShop::request()
+	{
+		if (pending)
+			return false;
+
+		pending = true;
+
+		return true;
+	}
+
+	void UICashShop::answered()
+	{
+		pending = false;
+	}
+
 	int16_t UICashShop::grid_cell(Point<int16_t> cursor, Point<int16_t> grid, size_t columns, size_t rows) const
 	{
 		Point<int16_t> in_grid = cursor - grid;
diff --git a/HeavenClient/IO/UITypes/UICashShop.h b/HeavenClient/IO/UITypes/UICashShop.h
index e3a3f1799..bc2614606 100644
--- a/HeavenClient/IO/UITypes/UICashShop.h
+++ b/HeavenClient/IO/UITypes/UICashShop.h
@@ -76,6 +76,13 @@ namespace ms
 		void remove_cash_item(int64_t cash_id);
 		void set_wish_list(const std::vector<int32_t>& sns);
 
+		// v83 (CCashShop+0x18) has one request out at a time and ignores the
+		// buttons until its answer. Returns whether one may be sent, counting
+		// it as sent.
+		bool request();
+		// A balance or an operation result came.
+		void answered();
+
 	private:
 		void change_tab(cash_catalog::Tab tab);
 		void change_subtab(size_t subtab);
@@ -165,6 +172,7 @@ namespace ms
 		int32_t credit;
 		int32_t points;
 		int32_t prepaid;
+		bool pending;
 
 		std::vector<CashItem> cash_items;
 		Slider cash_slider;
diff --git a/HeavenClient/IO/UITypes/UIEquipInventory.cpp b/HeavenClient/IO/UITypes/UIEquipInventory.cpp
index 9fd6da444..93284e628 100644
--- a/HeavenClient/IO/UITypes/UIEquipInventory.cpp
+++ b/HeavenClient/IO/UITypes/UIEquipInventory.cpp
@@ -219,12 +219,14 @@ namespace ms
 
 	void UIEquipInventory::update_slot(EquipSlot::Id slot)
 	{
-		if (int32_t item_id = inventory.get_item_id(InventoryType::Id::EQUIPPED, slot))
+		int16_t shown = inventory.shown_equip(slot);
+
+		if (int32_t item_id = inventory.get_item_id(InventoryType::Id::EQUIPPED, shown))
 		{
 			const Texture &texture = ItemData::get(item_id).get_icon(false);
 
 			icons[slot] = std::make_unique<Icon>(
-					std::make_unique<EquipIcon>(slot),
+					std::make_unique<EquipIcon>(shown),
 					texture,
 					-1
 			);
@@ -270,7 +272,7 @@ namespace ms
 				return Cursor::State::GRABBING;
 			} else
 			{
-				show_equip(slot);
+				show_equip(inventory.shown_equip(slot));
 
 				return Cursor::State::CANGRAB;
 			}
@@ -299,7 +301,8 @@ namespace ms
 
 		if (icons[slot])
 			if (int16_t freeslot = inventory.find_free_slot(InventoryType::Id::EQUIP))
-				Stage::get().get_player().request(UnequipItemPacket(slot, freeslot), ExclRequest::WAIT);
+				Stage::get().get_player().request(UnequipItemPacket(inventory.shown_equip(slot), freeslot),
+												  ExclRequest::WAIT);
 	}
 
 	bool UIEquipInventory::is_in_range(Point<int16_t> cursorpos) const
@@ -334,8 +337,8 @@ namespace ms
 
 	void UIEquipInventory::modify(int16_t pos, int8_t mode, int16_t arg)
 	{
-		EquipSlot::Id eqpos = EquipSlot::by_id(pos);
-		EquipSlot::Id eqarg = EquipSlot::by_id(arg);
+		EquipSlot::Id eqpos = EquipSlot::by_id(pos % Inventory::CASH_EQUIP);
+		EquipSlot::Id eqarg = EquipSlot::by_id(arg % Inventory::CASH_EQUIP);
 
 		switch (mode)
 		{
@@ -350,7 +353,7 @@ namespace ms
 		}
 	}
 
-	void UIEquipInventory::show_equip(EquipSlot::Id slot)
+	void UIEquipInventory::show_equip(int16_t slot)
 	{
 		UI::get().show_equip(Tooltip::Parent::EQUIPINVENTORY, slot);
 	}
@@ -386,7 +389,7 @@ namespace ms
 
 	void UIEquipInventory::EquipIcon::drop_on_equips(EquipSlot::Id slot) const
 	{
-		if (source == slot)
+		if (source % Inventory::CASH_EQUIP == slot)
 			Sound(Sound::Name::DRAGEND).play();
 	}
 
@@ -406,8 +409,11 @@ namespace ms
 
 		if (equip)
 		{
-			if (eqslot == source)
-				Stage::get().get_player().request(EquipItemPacket(slot, eqslot), ExclRequest::WAIT);
+			// Only an item worn at the same position swaps with this one.
+			int16_t worn = Stage::get().get_player().get_inventory().equip_position(slot, eqslot);
+
+			if (worn == source)
+				Stage::get().get_player().request(EquipItemPacket(slot, worn), ExclRequest::WAIT);
 		} else
 		{
 			Stage::get().get_player().request(UnequipItemPacket(source, slot), ExclRequest::WAIT);
diff --git a/HeavenClient/IO/UITypes/UIEquipInventory.h b/HeavenClient/IO/UITypes/UIEquipInventory.h
index 1dabfcae7..5b42ce749 100644
--- a/HeavenClient/IO/UITypes/UIEquipInventory.h
+++ b/HeavenClient/IO/UITypes/UIEquipInventory.h
@@ -54,7 +54,8 @@ namespace ms
 		Button::State button_pressed(uint16_t buttonid) override;
 
 	private:
-		void show_equip(EquipSlot::Id slot);
+		// Shows the tooltip for worn position `slot`.
+		void show_equip(int16_t slot);
 		void clear_tooltip();
 
 		void load_icons();
@@ -66,6 +67,7 @@ namespace ms
 		class EquipIcon : public Icon::Type
 		{
 		public:
+			// For the item at worn position `source`.
 			EquipIcon(int16_t source);
 
 			void drop_on_stage() const override;
diff --git a/HeavenClient/IO/UITypes/UIItemInventory.cpp b/HeavenClient/IO/UITypes/UIItemInventory.cpp
index 1f633eac3..12e4054db 100644
--- a/HeavenClient/IO/UITypes/UIItemInventory.cpp
+++ b/HeavenClient/IO/UITypes/UIItemInventory.cpp
@@ -676,7 +676,11 @@ namespace ms
 				{
 					case InventoryType::Id::EQUIP:
 						if (can_wear_equip(slot))
-							Stage::get().get_player().request(EquipItemPacket(slot, inventory.find_equipslot(item_id)), ExclRequest::WAIT);
+						{
+							int16_t worn = inventory.equip_position(slot, inventory.find_equipslot(item_id));
+
+							Stage::get().get_player().request(EquipItemPacket(slot, worn), ExclRequest::WAIT);
+						}
 
 						break;
 					case InventoryType::Id::USE:
@@ -1269,8 +1273,12 @@ namespace ms
 		{
 			case InventoryType::Id::EQUIP:
 				if (eqsource == eqslot)
+				{
+					int16_t worn = Stage::get().get_player().get_inventory().equip_position(source, eqslot);
+
 					if (parent.can_wear_equip(source))
-						Stage::get().get_player().request(EquipItemPacket(source, eqslot), ExclRequest::WAIT);
+						Stage::get().get_player().request(EquipItemPacket(source, worn), ExclRequest::WAIT);
+				}
 
 				Sound(Sound::Name::DRAGEND).play();
 
@@ -1300,13 +1308,15 @@ namespace ms
 
 				const Inventory &inventory = player.get_inventory();
 
-				// Also refuses an empty slot.
-				if (!scroll_rules::fits(item_id, inventory.get_item_id(InventoryType::Id::EQUIPPED, eqslot)))
+				// The scroll goes on the item shown there. Also refuses an empty slot.
+				int16_t target = inventory.shown_equip(eqslot);
+
+				if (!scroll_rules::fits(item_id, inventory.get_item_id(InventoryType::Id::EQUIPPED, target)))
 					break;
 
-				auto send = [slot = source, eqslot](bool whitescroll)
+				auto send = [slot = source, target](bool whitescroll)
 				{
-					Stage::get().get_player().request(ScrollEquipPacket(slot, eqslot, whitescroll), ExclRequest::WAIT);
+					Stage::get().get_player().request(ScrollEquipPacket(slot, target, whitescroll), ExclRequest::WAIT);
 				};
 
 				// Either answer scrolls; only Yes uses the White Scroll.
diff --git a/HeavenClient/Net/Handlers/CashShopHandlers.cpp b/HeavenClient/Net/Handlers/CashShopHandlers.cpp
index 5b74875f4..5cb0e79aa 100644
--- a/HeavenClient/Net/Handlers/CashShopHandlers.cpp
+++ b/HeavenClient/Net/Handlers/CashShopHandlers.cpp
@@ -113,7 +113,10 @@ namespace ms
 		int32_t prepaid = recv.read_int();
 
 		if (auto cashshop = UI::get().get_element<UICashShop>())
+		{
+			cashshop->answered();
 			cashshop->set_balance(credit, points, prepaid);
+		}
 	}
 
 	namespace
@@ -222,6 +225,8 @@ namespace ms
 		if (!cashshop)
 			return;
 
+		cashshop->answered();
+
 		uint8_t mode = static_cast<uint8_t>(recv.read_byte());
 
 		switch (mode)
diff --git a/HeavenClient/Net/Handlers/Helpers/CharacterParser.cpp b/HeavenClient/Net/Handlers/Helpers/CharacterParser.cpp
index d44ed8705..226470e5f 100644
--- a/HeavenClient/Net/Handlers/Helpers/CharacterParser.cpp
+++ b/HeavenClient/Net/Handlers/Helpers/CharacterParser.cpp
@@ -32,14 +32,16 @@ namespace ms
 
 		recv.skip(8);
 
+		// Worn regular items, worn cash items, and the Equip tab. Like v83, the
+		// cash items are kept 100 above their slot.
 		for (size_t i = 0; i < 3; i++)
 		{
-			InventoryType::Id inv = (i == 0) ? InventoryType::EQUIPPED : InventoryType::EQUIP;
+			InventoryType::Id inv = (i < 2) ? InventoryType::EQUIPPED : InventoryType::EQUIP;
 			int16_t pos = recv.read_short();
 
 			while (pos != 0)
 			{
-				int16_t slot = (i == 1) ? -pos : pos;
+				int16_t slot = (i == 1) ? pos + Inventory::CASH_EQUIP : pos;
 				ItemParser::parse_item(recv, inv, slot, invent);
 				pos = recv.read_short();
 			}
diff --git a/HeavenClient/Net/Handlers/SetFieldHandlers.cpp b/HeavenClient/Net/Handlers/SetFieldHandlers.cpp
index 85b1c1510..e7f9cc647 100644
--- a/HeavenClient/Net/Handlers/SetFieldHandlers.cpp
+++ b/HeavenClient/Net/Handlers/SetFieldHandlers.cpp
@@ -123,6 +123,10 @@ namespace ms
 		if (auto room = UI::get().get_element<UITradingRoom>())
 			room->close();
 
+		// v83 (FUN_00a03eba, from CField::OnSetField) sends this on every
+		// field change, not only on entering the game.
+		PlayerUpdatePacket().dispatch();
+
 		transition(mapid, portalid, chase);
 	}
 
diff --git a/HeavenClient/Net/Packets/InventoryPackets.h b/HeavenClient/Net/Packets/InventoryPackets.h
index 87af6e025..7bcfcd78f 100644
--- a/HeavenClient/Net/Packets/InventoryPackets.h
+++ b/HeavenClient/Net/Packets/InventoryPackets.h
@@ -76,12 +76,13 @@ namespace ms
 		}
 	};
 
-	// Packet which requests that an item is equipped
+	// Packet which requests that an item is equipped at worn position `dest`
+	// (Inventory::equip_position).
 	// Opcode: MOVE_ITEM(71)
 	class EquipItemPacket : public MoveItemPacket
 	{
 	public:
-		EquipItemPacket(int16_t src, EquipSlot::Id dest) : MoveItemPacket(InventoryType::Id::EQUIP, src, -dest, 1) {}
+		EquipItemPacket(int16_t src, int16_t dest) : MoveItemPacket(InventoryType::Id::EQUIP, src, -dest, 1) {}
 	};
 
 	// Packet which requests that an item is unequipped
@@ -273,7 +274,7 @@ namespace ms
 	class ScrollEquipPacket : public OutPacket
 	{
 	public:
-		ScrollEquipPacket(int16_t source, EquipSlot::Id target, bool whitescroll) : OutPacket(OutPacket::Opcode::SCROLL_EQUIP)
+		ScrollEquipPacket(int16_t source, int16_t target, bool whitescroll) : OutPacket(OutPacket::Opcode::SCROLL_EQUIP)
 		{
 			write_time();
 			write_short(source);
diff --git a/game/src/inventory.rs b/game/src/inventory.rs
index 1b61d2502..3a244fe4f 100644
--- a/game/src/inventory.rs
+++ b/game/src/inventory.rs
@@ -109,8 +109,14 @@ pub mod equip_slot {
         }
     }
 
-    /// Whether `item_id` may be worn at `position`.
-    pub fn fits(item_id: i32, position: i16) -> bool {
+    /// Whether `item_id` may be worn at `position`. As in v83, an item with
+    /// a cash serial is worn at its slot less 100, and any other at its slot.
+    pub fn fits(item_id: i32, cash: bool, position: i16) -> bool {
+        let position = match (cash, position) {
+            (true, -199..=-101) => position + 100,
+            (false, -99..=-1) => position,
+            _ => return false,
+        };
         match for_item(item_id) {
             Some(slot) if RINGS.contains(&slot) => RINGS.contains(&position),
             Some(slot) => slot == position,
@@ -570,7 +576,7 @@ impl Inventory {
             .get(InventoryType::Equip, from)
             .ok_or(InventoryError::InvalidSlot)?
             .clone();
-        if item.equip.is_none() || !equip_slot::fits(item.item_id, to) {
+        if item.equip.is_none() || !equip_slot::fits(item.item_id, item.cash_serial.is_some(), to) {
             return Err(InventoryError::CannotEquip);
         }
         let worn = |position: i16| self.equipped.get(&position).map(|i| i.item_id);
@@ -981,6 +987,27 @@ mod tests {
         );
     }
 
+    #[test]
+    fn cash_equips_are_worn_a_hundred_below_their_slot() {
+        let mut inventory = Inventory::default();
+        let mut cash_cap = equip(1002186);
+        cash_cap.cash_serial = Some(7);
+        inventory.insert(InventoryType::Equip, 1, cash_cap);
+        inventory.insert(InventoryType::Equip, 2, equip(1002008));
+        assert_eq!(
+            inventory.equip(1, equip_slot::CAP),
+            Err(InventoryError::CannotEquip)
+        );
+        assert_eq!(
+            inventory.equip(2, equip_slot::CAP - 100),
+            Err(InventoryError::CannotEquip)
+        );
+        inventory.equip(1, equip_slot::CAP - 100).unwrap();
+        inventory.equip(2, equip_slot::CAP).unwrap();
+        assert_eq!(inventory.equipped_regular().count(), 1);
+        assert_eq!(inventory.equipped_cash().count(), 1);
+    }
+
     #[test]
     fn overalls_and_pants_take_each_other_off() {
         let mut inventory = Inventory::default();