PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a ribbed knit fabric (likely cotton-spandex blend). It has high elasticity and a matte finish. It creates a form-fitting silhouette that conforms tightly to the body's curvature rather than draping loosely. It diffuses light with very low specularity; there should be no hard shine, only soft highlights on the peaks of the ribbing. - **Key Features:** The vertical ribbed texture is critical and must be preserved to maintain scale. The square neckline and wide tank-style straps are defining structural elements. The hem is cropped and straight, reinforced with a double-stitch line. The deep blue indigo color must remain consistent. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Unlike the user's current loose, puff-sleeved blouse, the target garment is tight. The simulation must map the fabric closely to the user's bust and ribcage. Since the new garment is sleeveless, the system must generatively inpaint the user's bare arms where the current floral sleeves exist, matching skin tone from the face/neck. The crop top hem will likely sit just above or touching the waistband of the user's light blue skirt. - **Occlusion Handling:** The user's long dark hair flows over the left shoulder (viewer's right). This hair mask must be segmented and layered *over* the new blue strap and clavicle area. The hands are resting low on the thighs and do not occlude the torso, but the ring on the left hand must be preserved if any hand-area inpainting occurs. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user's environment has diffuse overhead indoor lighting (likely a fluorescent tube or LED panel), casting soft, downward-directional shadows. The new garment must cast a slight drop shadow onto the user's midriff/skirt waistband. The shading on the blue fabric must darken towards the underarms and side seams to match the room's ambient occlusion. - **Color Calibration:** The source image is studio-lit with cool, neutral light. The user's room has a slightly warmer, dimmer ambient tone. The deep blue of the crop top must be color-graded (slightly warmed and exposure-reduced) to integrate with the indoor scene, ensuring it doesn't appear "superimposed" or unnaturally vibrant. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's facial features (eyes, nose, lips), makeup, and the exact hairline geometry must be masked and frozen. - **Body Integrity:** STRICTLY PROHIBITED to slim the user's waist or bust to match the source model. The new garment must stretch to accommodate the user's natural body volume. The skin tone generated for the arms must match the user's facial complexion exactly, preserving natural skin texture and avoiding a "plastic" look.