PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a ribbed knit (likely cotton-elastane blend). It possesses high elasticity and matte reflectance. Unlike the current stiff yellow fabric, the new simulation must exhibit "stretch and recovery" physics, hugging the torso contours while maintaining a soft, micro-textured surface. It should not shine; specular highlights must be diffuse. - **Key Features:** The vertical ribbing texture is critical and must curve appropriately around the cylindrical volumes of the arms and torso to convey 3D depth. The wide boat neckline and the finished straight hemline must be preserved. The long sleeves are a structural addition that must replace the current bare arms. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The target pose features a slight hip tilt and a bent right arm. The knit fabric must generate "honeycomb" compression folds at the inner right elbow and tension wrinkles across the chest due to the bust line. Since the source garment is full-length and the target wears high-waisted jeans, the simulation should calculate a natural drape that either interacts with the waistband (slight bunching) or falls just over the hips, covering the currently exposed midriff. - **Occlusion Handling:** 1. **Hair:** The user's long, dark wavy hair falls heavily over both shoulders and the chest. This is the primary occlusion layer and must be segmented and composited *over* the new garment. 2. **Accessories:** The white handbag in the left hand covers the left hip/thigh area; the new garment's hemline must pass *behind* this bag. The watch on the right wrist must either sit over the sleeve cuff or define the termination point of the sleeve. 3. **Hands:** The right thumb hooked into the pocket must remain visible; the sleeve cuff must accommodate this interaction. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The scene utilizes high-key, "outdoor studio" lighting, predominantly soft and diffuse with a cool, sky-blue ambient fill. The main directional light comes from the upper-left. The new garment must cast soft shadows onto the jeans and receive cast shadows from the user's hair and chin. - **Color Calibration:** The source cloth is a warm cream/off-white. To integrate into the blue-sky environment, the shadow areas of the white knit must pick up a slight cool/blue tint (ambient reflection) to avoid looking like a pasted sticker, while the highlights remain warm cream. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on the user's facial features (eyes, nose, lips), jawline definition, and the specific volumetric shape of the hairstyle. - **Body Integrity:** The user's shoulder width, arm volume, and waist circumference must remain mathematically identical to the original image. No digital slimming or reshaping of the torso is permitted; the garment must conform to the body, not the body to the garment. Skin tone on the neck (exposed by the boat neck) must match the face perfectly.