PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard cotton jersey or cotton-poly blend. It possesses a matte finish with high light absorption and low reflectivity. Unlike the user's current stiff button-down, the simulation must exhibit "soft body" dynamics, allowing for micro-wrinkles and a relaxed tension, particularly around the armholes and waist. - **Key Features:** - The specific typographic elements ("YELLOW IMAGES.COM", "MEN'S T-SHIRT MOCKUP" badge, and side text blocks) must remain undistorted and legible. - The contrasting orange/salmon crew-neck ribbing must be preserved. - The sleeve logos (right arm badge, left arm vertical text) must be positioned correctly on the biceps. - The bottom hemline must appear stitched and weighted, not razor-cut. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Shoulder & Chest:** The fabric must stretch slightly across the user's deltoids and pectorals, as the user has a broader build than the mannequin. The text on the chest should curve subtly to follow the volumetric geometry of the torso. - **Sleeve Transition:** This is a Critical Generation Event. The source is short-sleeved, while the user wears long sleeves. The simulation must generate realistic skin texture and arm anatomy for the user's forearms and elbows to replace the black fabric currently covering them. - **Waist:** The shirt should hang straight down from the chest (gravity-driven), avoiding the "tucked-in" look of the current garment. It should break slightly where it meets the hip/waistline of the joggers. - **Occlusion Handling:** - The user's chin and neck area are clear, but the current black collar occludes the neck. The VTO must mask out the black collar and in-paint the user's neck skin to meet the new crew neckline. - Hands are positioned away from the torso; no complex occlusion masking is required for the hands themselves. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user is illuminated by a somewhat harsh, top-down, slightly front-right artificial light source (indicated by the shadow on the wall behind the left shoulder). The new pink garment must cast self-shadows (under the pectorals and inside the sleeve hems) consistent with this hard lighting. The fabric highlight should be broad and diffuse, not specular. - **Color Calibration:** The source image has neutral studio white balance. The user image has a warm, tungsten-heavy indoor cast. The pink of the t-shirt must be color-graded (warmed up) and slightly desaturated to blend naturally with the ambient room tone, ensuring it does not appear "superimposed" or overly vibrant compared to the surroundings. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute pixel preservation required for the user's face, specifically the glasses frames, beard texture, and smile lines. The hairline and ears must remain untouched. - **Body Integrity:** The user's broad shoulder width and torso volume must be maintained. The simulation is strictly forbidden from slimming the user to match the mannequin's silhouette. The generated skin tone for the arms must perfectly match the user's facial complexion and hand color.