PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard cotton jersey knit. It possesses a matte finish with low reflectivity (high light absorption). The simulation must treat the fabric as medium-weight, meaning it should exhibit soft, rounded folds rather than sharp creases. It has isotropic elasticity, allowing for moderate stretch across the chest without appearing rigid. - **Key Features:** - The "NAUTICA" text logotype across the upper chest. - The tri-panel graphic print (three rectangles featuring sails) located centrally below the text. - The small "J-Class" sailboat logo on the lower right side (viewer's left). - The crew neckline ribbing structure. - Double-needle stitching at the hem and sleeve cuffs. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's leaning posture against the pillar (viewer's left), gravity will pull the fabric diagonally away from the contact point. The garment must compress and flatten against the wall on the user's right shoulder/torso (viewer's left side). Tension lines should appear across the chest, stretching from the leaning shoulder toward the opposite hip. The fabric must bunch slightly at the left armpit due to the arm's position. - **Occlusion Handling:** - The user's left wrist (wearing a silver watch) is positioned near the hip/waist area. If the new garment is longer than the original beige tee, it must drape *behind* the wrist and hand, or interact naturally with the top of the trousers. - The background pillar acts as a hard boundary; the shirt must not clip through the wall on the left side of the image. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features warm, overhead artificial lighting (tungsten/yellow hue), creating a strong contrast with deep shadows on the user's left side (viewer's right). The source image is cool, flat studio white. - **Color Calibration:** The light blue of the Nautica shirt must undergo a temperature shift, absorbing the ambient yellow light. This will likely shift the blue toward a slightly warmer, muted cyan or teal tone to integrate with the room's atmosphere. Shadows must be cast downward and to the right, matching the shadow density on the user's face. Grain/noise must be added to the high-resolution shirt texture to match the ISO/grain level of the target photo. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head, including the beard, hair, ears, and neck up to the clavicle, must be completely frozen and masked from alteration. - **Body Integrity:** The simulation is strictly forbidden from altering the user's BMI or skeletal structure. The width of the shoulders and the volume of the torso must remain consistent with the original image to preserve the user's physical identity. The leaning pose physics must dictate the cloth shape, not a template avatar.