PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard cotton jersey knit. It possesses a medium weight with low specular reflection (matte finish). Unlike the user's current heavy, textured acid-wash sweater, the new t-shirt requires a smoother surface simulation with higher frequency micro-wrinkles rather than deep, heavy folds. Light absorption should be consistent with cotton, avoiding any synthetic shine. - **Key Features:** The graphic placement is critical for realism. The "CHICAGO" text on the shoulders must wrap over the deltoids. The central graphics ("FR Fair Racing," "RT Racing Team," and the number "93") must sit centrally on the pectorals without distortion. The checkerboard pattern at the bottom hem must be preserved. The crew neck collar structure needs to replace the current thick sweater neckline. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** This is a Long-Sleeve to Short-Sleeve transfer. The new t-shirt sleeves will end at the mid-bicep. On the user's right arm (which is bent upwards), the sleeve aperture must distort naturally, pulling back slightly towards the shoulder due to gravity, rather than sticking to the arm. The fabric should drape loosely over the midsection, replacing the bulk of the current sweater with a straighter silhouette. *Note: Generative infilling will be required to create skin texture for the user's forearms where the old sweater sleeves currently exist.* - **Occlusion Handling:** The user's right hand and fingers (touching the chin) are the primary occlusion layer. The hand, wrist, and the silver bracelet must be segmented and masked to float *above* the new garment's collar area. The user's jawline beard and the tips of the hair near the temples must layer over the new collar/shoulder seam. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features soft, diffuse outdoor daylight, seemingly overcast (low contrast shadows). The light source is directional from the upper-front-left. The bright red of the source shirt must be subjected to ambient occlusion mapping to match this softness; shadows cast by the new sleeves onto the arms must be soft-edged, not hard. - **Color Calibration:** The source image is studio-lit with high saturation. To match the "dusty" outdoor palette of the user image, the red channel of the t-shirt needs slight desaturation and a minor cool-tone shift to harmonize with the grey/brown background tones. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's hair volume, sunglasses, facial hair (beard/stubble), and the specific structure of the nose and mouth must be frozen. The skin tone of the face must be sampled to ensure the newly generated forearm skin matches perfectly. - **Body Integrity:** The user's broad shoulder width and chest volume must remain constant. Do not slim the torso to fit the shirt; the shirt must warp to fit the torso. The pose of the bent right arm must remain geometrically identical.