diff --git a/src/features/autoScale/__tests__/detectClothBounds.test.ts b/src/features/autoScale/__tests__/detectClothBounds.test.ts
new file mode 100644
index 0000000..3d1d960
--- /dev/null
+++ b/src/features/autoScale/__tests__/detectClothBounds.test.ts
@@ -0,0 +1,13 @@
+import { detectClothWidthPx } from '../detectClothBounds';
+
+describe('detectClothWidthPx', () => {
+  it('v0 폴백: 자동 검출 미지원이므로 항상 0을 반환한다 (정식 구현은 Task 12)', async () => {
+    const result = await detectClothWidthPx('file://anyframe.jpg');
+    expect(result).toBe(0);
+  });
+
+  it('빈 문자열 입력도 동일하게 0 폴백', async () => {
+    const result = await detectClothWidthPx('');
+    expect(result).toBe(0);
+  });
+});
diff --git a/src/features/autoScale/detectClothBounds.ts b/src/features/autoScale/detectClothBounds.ts
new file mode 100644
index 0000000..7e776bf
--- /dev/null
+++ b/src/features/autoScale/detectClothBounds.ts
@@ -0,0 +1,12 @@
+/**
+ * v0 폴백: 카메라 프레임에서 사용자가 든 옷의 가로 픽셀 검출.
+ *
+ * v0에서는 항상 0을 반환 → calculateScale가 confidence=0으로 fallback,
+ * 사용자는 핀치 줌(usePinchScale)으로 직접 보정.
+ *
+ * 정식 구현은 Task 12: iOS Vision Saliency(VNGenerateAttentionBasedSaliencyImageRequest
+ * 또는 VNGenerateForegroundInstanceMaskRequest)로 손에 든 옷 mask → bbox 가로 너비.
+ */
+export async function detectClothWidthPx(_cameraFrameUri: string): Promise<number> {
+  return 0;
+}
diff --git a/src/features/autoScale/usePinchScale.ts b/src/features/autoScale/usePinchScale.ts
new file mode 100644
index 0000000..56cb947
--- /dev/null
+++ b/src/features/autoScale/usePinchScale.ts
@@ -0,0 +1,40 @@
+import { useCallback, useState } from 'react';
+import { Gesture } from 'react-native-gesture-handler';
+import { MIN_SCALE, MAX_SCALE } from './calculateScale';
+
+/**
+ * 핀치 줌 + 팬 hook. 자동 스케일 추정값을 초기값으로 받고 사용자가 직접 보정.
+ *
+ * Mac 실기기 검증 항목:
+ * - .runOnJS(true)로 worklet→JS thread 트램폴린 없이 setState 직접 호출 (reanimated 의존 회피)
+ * - 핀치 줌 [MIN_SCALE, MAX_SCALE] 클램핑이 calculateScale과 동일 범위인지
+ * - 팬은 누적 translation, reset은 initialScale로 복원
+ */
+export function usePinchScale(initialScale: number = 1) {
+  const [scale, setScale] = useState(initialScale);
+  const [tx, setTx] = useState(0);
+  const [ty, setTy] = useState(0);
+
+  const pinch = Gesture.Pinch()
+    .runOnJS(true)
+    .onUpdate((e) => {
+      setScale((s) => Math.max(MIN_SCALE, Math.min(MAX_SCALE, s * e.scale)));
+    });
+
+  const pan = Gesture.Pan()
+    .runOnJS(true)
+    .onUpdate((e) => {
+      setTx((x) => x + e.translationX);
+      setTy((y) => y + e.translationY);
+    });
+
+  const gesture = Gesture.Simultaneous(pinch, pan);
+
+  const reset = useCallback(() => {
+    setScale(initialScale);
+    setTx(0);
+    setTy(0);
+  }, [initialScale]);
+
+  return { scale, tx, ty, gesture, reset };
+}