PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a ribbed cotton-blend knit (likely jersey or interlock). It is matte with low specularity (no shine) but high texture depth due to the vertical ribbing. The physics simulation must treat this as a high-friction, stretchy material that conforms tightly to the skin rather than draping loosely like the user's current yellow top. - **Key Features:** - **Logo Orientation:** The source image is a mirror selfie (text reads "qAG"). The texture map must be horizontally flipped so the "GAP" logo reads correctly from left to right on the target user. - **Texture:** The vertical ribbing pattern is the primary normal map detail and must be preserved to avoid looking flat. - **Construction:** Thick binding (piping) around the neckline and armholes. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The target user is currently wearing a loose, peplum-style yellow top. The simulation must ignore the volume of the yellow fabric and estimate the user's actual torso geometry beneath it. The new garment is a form-fitting tank top; it should follow the curvature of the bust and waist closely, ending at the waistband of the white trousers (appearing tucked in or cropped at the waist). - **Occlusion Handling:** - **Right Hand:** The user's right hand is touching her upper chest/neck area. This hand must be segmented out and layered *over* the right strap of the new tank top. - **Hair:** Long dark hair falls over both shoulders (particularly the right side). A detailed hair mask is required to ensure the hair strands lie on top of the white fabric, casting appropriate shadows. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment is high-contrast outdoor daylight (riverbed) with strong overhead sunlight. The source garment was photographed in soft, indoor artificial light with a purple color cast. - **Action:** Increase exposure on the white tank top significantly to match the outdoor brightness. Apply "hard" shadows generated by the user's hand and hair onto the chest area, consistent with the sharp shadows seen on the river rocks. - **Color Calibration:** Remove the slight purple/warm hue reflected from the source room's walls. Retune the white point of the tank top to match the "cool white" of the rushing water foam and the user's existing white pants, ensuring the whites look cohesive. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on the facial region (jawline up), specifically preserving the sunglasses, nose, and smile. - **Body Integrity:** Do not generate an idealized or slimmed waistline. The simulation must respect the user's natural arm width and shoulder structure. Since the new top is tighter than the old one, the skin texture of the arms and décolletage must be seamlessly blended where the strap width changes.