PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a ribbed knit (likely cotton-elastane blend). It has a matte finish with low specularity (no shine). Physics properties suggest moderate elasticity with a "snug" fit tension rather than a loose gravity-based drape. The texture mapping must preserve the vertical ribbing pattern which should distort slightly around curvature (bust). - **Key Features:** 1. **Inverted-V Hemline:** The bottom hem features a distinct upward cut at the center navel area which must be preserved. 2. **Central Split/Placket:** The vertical center opening (buttonless or hidden closure) is a structural anchor point. 3. **Deep V-Neck:** The neckline is low and angular. 4. **Sleeveless Cut:** The armholes are high-cut; the user's current lace sleeves must be completely removed and replaced with skin generation. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Fit Tension:** Unlike the user's current loose blouse, the source top is form-fitting/body-con. The mesh must wrap tightly against the user's torso geometry. - **Length Adjustment:** The source is a crop top. The simulation must expose the user's midriff (navel area). This requires erasing the lower portion of the current grey blouse and generating realistic skin texture for the stomach and upper arms to match the user's visible forearms. - **Shoulder Anchoring:** The straps must sit flat on the user's trapezius muscles without hovering. - **Occlusion Handling:** - **Hair:** The user has dark, shoulder-length hair resting on both clavicles. The new garment straps must be layered *underneath* this hair. A segmentation mask must isolate the hair strands to ensure they cast shadows onto the white fabric, not vice versa. - **Hands/Wrists:** The user's hands are clasped low. While they do not overlap the crop top area, the fabric of the *old* shirt currently behind the hands must be removed and replaced with the user's jeans waistband or skin. The watch on the left wrist must remain untouched. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user's environment has soft, diffuse indoor lighting coming from the viewer's left (casting soft shadows to the right). The source image has high-contrast outdoor lighting. The new garment's brightness must be lowered to match the indoor ambient occlusion. - **Shadow Projection:** - The hair must cast soft, diffuse shadows onto the white ribbed fabric. - The hem of the crop top must cast a contact shadow onto the user's newly exposed midriff skin to ground the garment. - **Color Calibration:** The source white is cool-toned (outdoor daylight). It must be color-graded to a slightly warmer, neutral white/cream to match the color temperature of the user's room and wall. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head (hairline to chin), facial expression, and neck structure must be frozen and masked out of the generation zone. - **Body Integrity:** - **No Body Reshaping:** Do not alter the user's waist width to match the source model. The crop top must expand horizontally to fit the user's natural proportions. - **Skin Tone Consistency:** The generated skin for the upper arms (replacing sleeves) and midriff (replacing shirt hem) must perfectly match the pixel values and grain of the user's face and forearms.