PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard cotton jersey knit. It possesses a matte finish with low specular reflection, unlike the high-gloss leather jacket currently worn by the user. The simulation must treat the fabric as pliable and breathable, exhibiting soft fold recovery rather than stiff creases. - **Key Features:** The central "REVERSE" graphic (pink/purple typography and white wireframe globe grid) is the primary anchor point and must be centered on the sternum. The crew neckline structure and the hem stitching must be preserved. The deep black hue of the fabric must be maintained without crushing shadow detail. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is currently wearing a bulky leather jacket which artificially expands the silhouette. The simulation must reduce the upper body volume to reflect the thinner profile of a t-shirt against the skin. Because the user has his hands in his pockets, the t-shirt hemline will encounter friction and tension at the hips; the fabric should drape over the wrists and bunch slightly where the forearms press against the torso, rather than hanging perfectly straight. - **Occlusion Handling:** The current leather jacket and beige undershirt must be completely masked out. The critical occlusion points are the user's wrists/hands entering the trouser pockets. The t-shirt hem must appear to interact physically with the wrists or tuck behind them depending on length, ensuring the checkered trousers remain visible from the waist down. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features harsh, high-altitude outdoor sunlight coming from the viewer's left (user's right). The generated t-shirt must exhibit high-contrast lighting: bright, warm highlights on the right shoulder and chest, with deep, sharp shadows cast towards the left side of the torso. - **Color Calibration:** The studio-neutral black of the source cloth must be graded to match the outdoor scene. It requires a slight cool-blue tint in the shadow areas to reflect the ambient skylight of the mountain environment, preventing the black from looking like a flat "cutout." PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head, including the specific hairstyle, facial hair (beard/mustache), and sunglasses, must be rigidly frozen. The transition from the new crew neck to the user's neck skin needs to be seamless. - **Body Integrity:** Do not slim the user to match the leaner physique of the source model. The user's broad shoulder width and chest dimensions must be preserved to maintain anatomical realism, only reducing the artificial bulk added by the leather jacket.