PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a ribbed knit fabric (likely cotton-elastane blend). It has a matte finish with low specular reflection but high texture depth due to the vertical ribbing. The physics engine must simulate high elasticity and tension; the fabric should stretch around curves rather than draping loosely. - **Key Features:** The square neckline and wide shoulder straps are structural constants. The cropped hemline is critical; unlike the user's current tucked-in shirt, this garment ends above the navel. The vertical ribbed texture pattern must scale correctly with the stretch of the fabric. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Silhouette Change:** The target garment is sleeveless, while the user is wearing long sleeves. The simulation must generate accurate skin texture and tone for the user's arms and shoulders to replace the black fabric. - **Tension Points:** As a form-fitting crop top, the mesh must exhibit tension across the bust and tapering at the waist. It should sit flush against the skin without the bunching seen in the user's current loose-fitting black top. - **Occlusion Handling:** - **Primary Occlusion:** The phone and both hands are positioned directly over the center torso. High-precision masking is required to layer the hands and phone *over* the new blue top. Shadows from the hands must be cast onto the new fabric. - **Secondary Occlusion:** The gold chain strap of the handbag (viewer's right shoulder) and the loose hair falling over the chest (viewer's left) must be segmented and layered on top of the new garment. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user is in a commercial retail environment with a grid of overhead recessed lighting. The lighting is diffuse but directional from above, creating soft shadows downwards. The new garment must render with ambient occlusion darkening the area under the bust and near the armpits. - **Color Calibration:** The source image is lit by flat studio strobe lighting. The target environment is slightly warmer/yellower due to store lighting. The Navy Blue of the crop top must be color-graded to reflect the ambient warm tones of the store to prevent it from looking like a "sticker." PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's visible facial features (forehead, eyes, nose, cheeks) and specific hairstyle/hairline must remain completely frozen. - **Body Integrity:** STRICT PROHIBITION on body warping. The user's torso width, bust size, and hip curvature must remain unchanged. The garment mesh must deform to fit the user's existing volume, not the other way around. No "slimming" filters allowed.