PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a light gauge cotton jersey knit. It possesses low structural rigidity and high pliability. Unlike the target's current stiff woven button-down, this material has a matte finish with minimal specular highlights. It simulates soft body dynamics, meaning it will drape closely to the torso without sharp angular folds. - **Key Features:** The central "VACATION MOOD" typography and the white graphic print (palm trees/surfboards) are the primary visual anchors and must undergo non-rigid deformation consistent with the chest curvature. The crew neckline and deep sleeveless armholes are topological invariants that must replace the current collared geometry. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is standing in a neutral, upright anatomical position. The tank top must hang from the trapezius and shoulders, falling vertically due to gravity with minimal tension lines across the midsection. Unlike the current tucked/structured shirt, the hemline of the tank top should fall naturally over the waist of the white trousers, creating a slight gap or shadow at the belt line. - **Occlusion Handling:** 1. **Skin Generation (Critical):** The target is wearing long sleeves, but the source is sleeveless. The simulation must logically infer and generate bare arm skin tone consistent with the user's face and hands to replace the black sleeves. 2. **Accessories:** The red wristband (Kalava) on the right wrist and the watch on the left wrist are outside the garment ROI but must be preserved as foreground layers. 3. **Neck:** The current collar obscures the base of the neck. The VTO must in-paint the clavicle area to accommodate the lower crew neck of the tank top. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment is a hallway with warm, diffuse overhead lighting (likely tungsten or warm LED) casting soft, downward-directional shadows. The source garment's studio-cool lighting must be temperature-shifted towards warm yellow/orange. Shadows must be generated under the pectoral muscles and the garment hem to match the room's occlusion ambient occlusion. - **Color Calibration:** The pastel green of the tank top must be desaturated slightly and tinted with the ambient yellow of the hallway walls to avoid looking like a "sticker." The white text must not be pure #FFFFFF; it requires a creamy tint to match the white balance of the user's trousers. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute pixel freeze required for the user's face (eyes to chin), ears, and the specific volumetric hairstyle. The transition from the new generated neck skin to the existing jawline must be seamless. - **Body Integrity:** The user has a slimmer build than the model in the source image. The simulation must warp the tank top to fit the user's narrower frame *without* expanding the user's shoulder width or chest volume to match the muscle model. The generated arms must maintain the skeletal proportions evident in the user's visible wrists.