diff --git a/docs/STYLING.md b/docs/STYLING.md
index 063accaa..156c7a97 100644
--- a/docs/STYLING.md
+++ b/docs/STYLING.md
@@ -42,9 +42,9 @@ with no class and no JS required. Neither step injects styles at runtime.
   own `invalidIndicator` slot rather than a mask: `InputGroup` (`primitives/input-group/`) reads
   React Aria's `Group` `isInvalid` render prop and renders the icon itself, so an invalid control
   cannot be composed without a non-colour cue. The recipe owns only the icon's colour and margins —
-  `Icon` owns its box, and `IconSizeProvider` (`INPUT_GROUP_ICON_SIZE`) owns its per-size step — and
-  gives the `suffix` slot the same `order: 1` for the same Spectrum ordering. Combobox's control is
-  not a plain `Group` with that state to hand, so it stays CSS-driven.
+  `Icon` owns its box, and `IconSizeProvider` (`FIELD_CONTROL_ICON_SIZE`) owns its per-size step —
+  and gives the `suffix` slot the same `order: 1` for the same Spectrum ordering. Combobox's control
+  is not a plain `Group` with that state to hand, so it stays CSS-driven.
 - `overlays/mobile-overlay.css.ts`: the scrim, tray, and dialog styles `MobileOverlay` renders for
   the mobile combobox tray, based on Apache-2.0 React Spectrum's `Tray.tsx` and `tray/index.css`.
 - `overlays/`: the private mobile tray plumbing. `mobile-overlay.tsx` wraps React Aria's
diff --git a/packages/@luke-ui/react/src/combobox-field/combobox-field.tsx b/packages/@luke-ui/react/src/combobox-field/combobox-field.tsx
index 9b5011d1..0a5a2695 100644
--- a/packages/@luke-ui/react/src/combobox-field/combobox-field.tsx
+++ b/packages/@luke-ui/react/src/combobox-field/combobox-field.tsx
@@ -31,7 +31,7 @@ import { ComboboxRoot } from '../primitives/combobox/root.js';
 import { comboboxRecipe } from '../primitives/combobox/styles.css.js';
 import { ComboboxTrigger } from '../primitives/combobox/trigger.js';
 import { Field } from '../primitives/field/field.js';
-import { COMBOBOX_ICON_SIZE } from '../sizing/combobox-sizing.js';
+import { FIELD_CONTROL_ICON_SIZE } from '../sizing/control-size.js';
 import type { DistributiveOmit } from '../types/distributive-omit.js';
 import type { Prettify } from '../types/prettify.js';
 import { cx } from '../utils/utils.js';
@@ -249,7 +249,7 @@ function MobileComboboxContent<T extends object>({
 	return (
 		<>
 			<ComboboxInputGroup>
-				<IconSizeProvider size={COMBOBOX_ICON_SIZE[size]}>
+				<IconSizeProvider size={FIELD_CONTROL_ICON_SIZE[size]}>
 					<RacButton
 						aria-expanded={state.isOpen}
 						aria-haspopup="dialog"
@@ -307,7 +307,7 @@ function MobileComboboxClearButton({ size }: { size: ComboboxSize }): JSX.Elemen
 	if (state == null || state.inputValue === '') return null;
 
 	return (
-		<IconSizeProvider size={COMBOBOX_ICON_SIZE[size]}>
+		<IconSizeProvider size={FIELD_CONTROL_ICON_SIZE[size]}>
 			<RacButton
 				aria-label="Clear search"
 				className={comboboxRecipe({ size }).clearButton()}
diff --git a/packages/@luke-ui/react/src/primitives/combobox/clear-button.tsx b/packages/@luke-ui/react/src/primitives/combobox/clear-button.tsx
index 02d614e1..fbac4f45 100644
--- a/packages/@luke-ui/react/src/primitives/combobox/clear-button.tsx
+++ b/packages/@luke-ui/react/src/primitives/combobox/clear-button.tsx
@@ -4,7 +4,7 @@ import type { ButtonProps as RacButtonProps } from 'react-aria-components/ComboB
 import { ComboBoxStateContext, Button as RacButton } from 'react-aria-components/ComboBox';
 import { composeRenderProps } from 'react-aria-components/composeRenderProps';
 import { IconSizeProvider } from '../../icon/icon-size-context.js';
-import { COMBOBOX_ICON_SIZE } from '../../sizing/combobox-sizing.js';
+import { FIELD_CONTROL_ICON_SIZE } from '../../sizing/control-size.js';
 import type { DistributiveOmit } from '../../types/distributive-omit.js';
 import type { Prettify } from '../../types/prettify.js';
 import type { ComboboxSize } from './root.js';
@@ -32,7 +32,7 @@ export function ComboboxClearButton(props: ComboboxClearButtonProps): JSX.Elemen
 	}
 
 	return (
-		<IconSizeProvider size={COMBOBOX_ICON_SIZE[size]}>
+		<IconSizeProvider size={FIELD_CONTROL_ICON_SIZE[size]}>
 			<RacButton
 				{...buttonProps}
 				className={composeRenderProps(buttonProps.className, (className) => {
diff --git a/packages/@luke-ui/react/src/primitives/combobox/item.tsx b/packages/@luke-ui/react/src/primitives/combobox/item.tsx
index 6eb0e73a..2fd08dc0 100644
--- a/packages/@luke-ui/react/src/primitives/combobox/item.tsx
+++ b/packages/@luke-ui/react/src/primitives/combobox/item.tsx
@@ -10,7 +10,8 @@ import {
 import { composeRenderProps } from 'react-aria-components/composeRenderProps';
 import { IconSizeProvider } from '../../icon/icon-size-context.js';
 import { Icon } from '../../icon/icon.js';
-import { COMBOBOX_CHECK_ICON_SIZE, COMBOBOX_ICON_SIZE } from '../../sizing/combobox-sizing.js';
+import { COMBOBOX_CHECK_ICON_SIZE } from '../../sizing/combobox-sizing.js';
+import { FIELD_CONTROL_ICON_SIZE } from '../../sizing/control-size.js';
 import type { DistributiveOmit } from '../../types/distributive-omit.js';
 import type { Prettify } from '../../types/prettify.js';
 import type { ComboboxSize } from './root.js';
@@ -45,7 +46,7 @@ export function ComboboxItem<T extends object>(props: ComboboxItemProps<T>): JSX
 				// RAC renders item content outside this component's original tree.
 				// Put the provider inside the item render function so the content receives the context.
 				return (
-					<IconSizeProvider size={COMBOBOX_ICON_SIZE[size]}>
+					<IconSizeProvider size={FIELD_CONTROL_ICON_SIZE[size]}>
 						{children}
 						{isSelected ? (
 							<Icon
diff --git a/packages/@luke-ui/react/src/primitives/combobox/styles.css.ts b/packages/@luke-ui/react/src/primitives/combobox/styles.css.ts
index 5cb394ae..0970f22a 100644
--- a/packages/@luke-ui/react/src/primitives/combobox/styles.css.ts
+++ b/packages/@luke-ui/react/src/primitives/combobox/styles.css.ts
@@ -1,6 +1,6 @@
 import type { StyleRule } from '@vanilla-extract/css';
 import { createVar } from '@vanilla-extract/css';
-import { COMBOBOX_ICON_SIZE } from '../../sizing/combobox-sizing.js';
+import { FIELD_CONTROL_ICON_SIZE } from '../../sizing/control-size.js';
 import { focusRing, restingFocusRing } from '../../styles/focus-ring.js';
 import {
 	composeInputStateSelectors,
@@ -18,7 +18,7 @@ import { recipe } from '../../styles/recipe.js';
 import { vars } from '../../theme/contract.css.js';
 import { FONT_METRIC_SCALE } from '../../theme/font-metric-scale.js';
 
-// Set per `size` variant on `inputGroup` below, from `COMBOBOX_ICON_SIZE`, so the invalid
+// Set per `size` variant on `inputGroup` below, from `FIELD_CONTROL_ICON_SIZE`, so the invalid
 // `::after` icon matches the trigger/clear chevrons at each size instead of a constant.
 const comboboxErrorIconSize = createVar();
 
@@ -427,7 +427,7 @@ const comboboxConfig = {
 				inputGroup: {
 					blockSize: vars.controlSize.medium,
 					fontSize: FONT_METRIC_SCALE[16].fontSize,
-					vars: { [comboboxErrorIconSize]: vars.iconSize[COMBOBOX_ICON_SIZE.medium] },
+					vars: { [comboboxErrorIconSize]: vars.iconSize[FIELD_CONTROL_ICON_SIZE.medium] },
 				},
 				textInput: {
 					blockSize: vars.controlSize.medium,
@@ -458,7 +458,7 @@ const comboboxConfig = {
 					fontSize: FONT_METRIC_SCALE[14].fontSize,
 					letterSpacing: FONT_METRIC_SCALE[14].letterSpacing,
 					lineHeight: FONT_METRIC_SCALE[14].lineHeight,
-					vars: { [comboboxErrorIconSize]: vars.iconSize[COMBOBOX_ICON_SIZE.small] },
+					vars: { [comboboxErrorIconSize]: vars.iconSize[FIELD_CONTROL_ICON_SIZE.small] },
 				},
 				textInput: {
 					blockSize: vars.controlSize.small,
diff --git a/packages/@luke-ui/react/src/primitives/combobox/trigger.tsx b/packages/@luke-ui/react/src/primitives/combobox/trigger.tsx
index 05dd78dc..41937d58 100644
--- a/packages/@luke-ui/react/src/primitives/combobox/trigger.tsx
+++ b/packages/@luke-ui/react/src/primitives/combobox/trigger.tsx
@@ -3,7 +3,7 @@ import type { ButtonProps as RacButtonProps } from 'react-aria-components/ComboB
 import { Button as RacButton } from 'react-aria-components/ComboBox';
 import { composeRenderProps } from 'react-aria-components/composeRenderProps';
 import { IconSizeProvider } from '../../icon/icon-size-context.js';
-import { COMBOBOX_ICON_SIZE } from '../../sizing/combobox-sizing.js';
+import { FIELD_CONTROL_ICON_SIZE } from '../../sizing/control-size.js';
 import type { DistributiveOmit } from '../../types/distributive-omit.js';
 import type { Prettify } from '../../types/prettify.js';
 import type { ComboboxSize } from './root.js';
@@ -25,7 +25,7 @@ export function ComboboxTrigger(props: ComboboxTriggerProps): JSX.Element {
 	const size = useComboboxSize(sizeProp);
 
 	return (
-		<IconSizeProvider size={COMBOBOX_ICON_SIZE[size]}>
+		<IconSizeProvider size={FIELD_CONTROL_ICON_SIZE[size]}>
 			<RacButton
 				{...buttonProps}
 				className={composeRenderProps(buttonProps.className, (className) => {
diff --git a/packages/@luke-ui/react/src/primitives/input-group/input-group.tsx b/packages/@luke-ui/react/src/primitives/input-group/input-group.tsx
index 4bc48117..862bb64d 100644
--- a/packages/@luke-ui/react/src/primitives/input-group/input-group.tsx
+++ b/packages/@luke-ui/react/src/primitives/input-group/input-group.tsx
@@ -7,7 +7,7 @@ import { Input as RacInput } from 'react-aria-components/Input';
 import { composeRenderProps } from 'react-aria-components/composeRenderProps';
 import { IconSizeProvider } from '../../icon/icon-size-context.js';
 import { Icon } from '../../icon/icon.js';
-import { INPUT_GROUP_ICON_SIZE } from '../../sizing/input-group-sizing.js';
+import { FIELD_CONTROL_ICON_SIZE } from '../../sizing/control-size.js';
 import type { DistributiveOmit } from '../../types/distributive-omit.js';
 import type { Prettify } from '../../types/prettify.js';
 import type { InputGroupSize } from './recipe.css.js';
@@ -112,9 +112,9 @@ export function InputGroup(props: InputGroupProps): JSX.Element {
 			 * The provider covers the whole group, not only the indicator below: it sizes
 			 * the group's own error icon *and* any icon a caller puts in a prefix or
 			 * suffix, so both stay proportioned to the control. Same precedent as
-			 * `Button` (`BUTTON_ICON_SIZE`) and `ComboboxTrigger` (`COMBOBOX_ICON_SIZE`).
+			 * `Button` (`BUTTON_ICON_SIZE`) and the field controls (`FIELD_CONTROL_ICON_SIZE`).
 			 */}
-			<IconSizeProvider size={INPUT_GROUP_ICON_SIZE[size]}>
+			<IconSizeProvider size={FIELD_CONTROL_ICON_SIZE[size]}>
 				<RacGroup
 					{...groupProps}
 					className={composeRenderProps(className, (value) => {
diff --git a/packages/@luke-ui/react/src/primitives/input-group/recipe.css.ts b/packages/@luke-ui/react/src/primitives/input-group/recipe.css.ts
index c897cd37..7342c1db 100644
--- a/packages/@luke-ui/react/src/primitives/input-group/recipe.css.ts
+++ b/packages/@luke-ui/react/src/primitives/input-group/recipe.css.ts
@@ -171,7 +171,7 @@ const inputGroupConfig = {
 		// The invalid icon `InputGroup` renders itself. Only colour and spacing here:
 		// the element is a real `Icon`, so `icon.css.ts` already owns its box dimensions
 		// and `flexShrink`, and its per-size step comes from the `IconSizeProvider`
-		// `InputGroup` wraps the group in (`INPUT_GROUP_ICON_SIZE`) rather than from a
+		// `InputGroup` wraps the group in (`FIELD_CONTROL_ICON_SIZE`) rather than from a
 		// variant here. `color`, not `background-color`, because an `Icon` fills with
 		// `currentColor`. `CanvasText` (not the gated danger token) keeps it a solid,
 		// high-contrast shape when author colours are ignored.
diff --git a/packages/@luke-ui/react/src/sizing/combobox-sizing.ts b/packages/@luke-ui/react/src/sizing/combobox-sizing.ts
index 3d67a168..74aa1462 100644
--- a/packages/@luke-ui/react/src/sizing/combobox-sizing.ts
+++ b/packages/@luke-ui/react/src/sizing/combobox-sizing.ts
@@ -1,15 +1,8 @@
 import type { IconSize } from '../types/icon-size.js';
-import type { FieldControlSize } from './control-size.js';
-
-/** Maps combobox control size to the appropriate icon size. */
-export const COMBOBOX_ICON_SIZE: Record<FieldControlSize, IconSize> = {
-	medium: 'small',
-	small: 'xsmall',
-};
 
 /**
  * Size of the selected-item check icon. The check sits beside option text
  * rather than scaling with the control, so it stays fixed at both combobox
- * sizes instead of following `COMBOBOX_ICON_SIZE`.
+ * sizes instead of following `FIELD_CONTROL_ICON_SIZE`.
  */
 export const COMBOBOX_CHECK_ICON_SIZE: IconSize = 'xsmall';
diff --git a/packages/@luke-ui/react/src/sizing/control-size.ts b/packages/@luke-ui/react/src/sizing/control-size.ts
index b0806364..9e8391f8 100644
--- a/packages/@luke-ui/react/src/sizing/control-size.ts
+++ b/packages/@luke-ui/react/src/sizing/control-size.ts
@@ -1,6 +1,7 @@
+import type { IconSize } from '../types/icon-size.js';
+
 /**
- * Size union shared by the field controls (`Combobox`, `InputGroup`) whose icon-size
- * maps (`COMBOBOX_ICON_SIZE`, `INPUT_GROUP_ICON_SIZE`) are keyed by it.
+ * Size union shared by the field controls (`Combobox`, `InputGroup`).
  *
  * Named apart from the `vars.controlSize` theme token — that's the physical block-size
  * value shared by every sized control (buttons included); this is a type, scoped to the
@@ -12,3 +13,9 @@
  * exactly this union so the two can never drift apart.
  */
 export type FieldControlSize = 'medium' | 'small';
+
+/** Maps field control size to the icon size those controls provide. */
+export const FIELD_CONTROL_ICON_SIZE: Record<FieldControlSize, IconSize> = {
+	medium: 'small',
+	small: 'xsmall',
+};
diff --git a/packages/@luke-ui/react/src/sizing/input-group-sizing.ts b/packages/@luke-ui/react/src/sizing/input-group-sizing.ts
deleted file mode 100644
index 8835ae68..00000000
--- a/packages/@luke-ui/react/src/sizing/input-group-sizing.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import type { IconSize } from '../types/icon-size.js';
-import type { FieldControlSize } from './control-size.js';
-
-/**
- * Maps `InputGroup` control size to the icon size it provides through
- * `IconSizeProvider` — its own invalid indicator and any icon a caller puts in a
- * prefix or suffix. Mirrors `COMBOBOX_ICON_SIZE` (`sizing/combobox-sizing.ts`) so the
- * two field controls scale their icons the same way.
- */
-export const INPUT_GROUP_ICON_SIZE: Record<FieldControlSize, IconSize> = {
-	medium: 'small',
-	small: 'xsmall',
-};