PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment appears to be a lightweight Viscose or Rayon blend, indicated by its soft drape and matte texture. It has low structural rigidity compared to the user's current cotton t-shirt. The fabric should exhibit low specularity (not shiny) but must show soft, diffuse highlighting on folds. - **Key Features:** The complex "Bandana/Paisley" patchwork print is high-frequency data that must remain sharp; distortion must follow the geometry of the cloth, not the pixels. The Camp Collar (Cuban collar) structure is distinct and must replace the current crew neckline. Black buttons and the stitched front placket are essential rigid details. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Right Arm (Behind Back):** This is a critical tension point. The fabric must stretch tightly across the right pectoral and right deltoid. Expect significant tensile wrinkling radiating from the right armpit towards the sternum. The right sleeve aperture will be distorted and pulled backward. - **Left Arm (Neutral):** The fabric will drape vertically with gravity. The sleeve should flare slightly away from the bicep, maintaining the "relaxed fit" of the source item. - **Torso:** The source shirt is looser than the target t-shirt. The simulation must create a "billowing" effect slightly away from the stomach, rather than clinging to the abs. - **Occlusion Handling:** - The user's **Right Arm** disappears behind the torso; the shirt hem on the right side must flow cleanly over the hip without clipping into the hidden forearm. - The user's **Left Wristwatch** is located below the sleeve line but must remain layered *over* any potential shadow cast by the new sleeve. - **Neckline Replacement:** The user's current high crew-neck t-shirt covers skin that the new open-collar shirt will expose. Accurate skin-tone inpainting is required for the upper chest/clavicle area. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user image utilizes natural, diffuse outdoor lighting (likely overcast or shaded) with a cool color temperature. The source image is warm studio lighting. The rendered shirt must shed the warm/yellow tint of the studio and adopt the cool, neutral ambient light of the garden. Shadows should be soft (low contrast) and fall primarily downwards. - **Color Calibration:** The deep black of the source shirt must be lifted slightly to a dark charcoal/slate tone to match the dynamic range of the outdoor photo. A subtle green color spill (bounce light) from the surrounding hedges should be applied to the extreme edges of the fabric to ground it in the scene. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's head (hair, eyes, nose, mouth, ears) and the jawline are absolute freeze zones. The neck area immediately under the chin must be preserved, transitioning seamlessly into the inpainted upper chest. - **Body Integrity:** STRICT PROHIBITION on altering the user's shoulder width or waist circumference. The user's jeans and sneakers must remain pixel-perfect. The volume of the new shirt must add to the silhouette, not subtract from the user's existing body mass.