PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard lightweight cotton jersey. It possesses a matte finish with low specularity (non-reflective). The simulation must exhibit "soft-body" dynamics, showing small micro-folds at tension points rather than rigid creases. Light diffusion should be high (subsurface scattering) to mimic breathable fabric. - **Key Features:** The specific graphic placement is critical: the "YELLOW IMAGES.COM" text centered on the chest, the "MEN'S T-SHIRT MOCKUP" badge on the right pectoral, and the orange crew-neck collar trim. The sleeve graphics (orange stamp on left sleeve, logo on right sleeve) must be preserved and mapped correctly to the arm geometry. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The target shirt is short-sleeved, while the user is currently wearing a long-sleeved base layer. The simulation must generate accurate skin texture for the user's lower arms (forearms) where the black sleeves are currently visible. The new shirt should drape loosely over the torso with a slight fold accumulation above the belt line, mimicking a relaxed fit. - **Occlusion Handling:** CRITICAL: The leather jacket held over the right shoulder is a massive foreground occlusion. The pink t-shirt must be rendered *underneath* the jacket and the right hand holding it. The jacket's weight presses the fabric against the right trapezius; the simulation must flatten the t-shirt fabric here. The left hand is in the pocket; the t-shirt hemline must interact naturally with the wrist/forearm, potentially bunching slightly or hanging just above the wrist entry point. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user scene utilizes soft studio lighting originating from the top-left, casting soft shadows towards the bottom-right. The pink garment must accept shadows cast *by* the leather jacket on the right side of the chest. The highlights on the pink cotton should be diffused, matching the soft fall-off seen on the user's face. - **Color Calibration:** The user image has a slightly cool, desaturated grade. The vibrant peach/pink of the source cloth must be slightly desaturated and color-temperature shifted (cooler) to blend with the grey background and neutral tones of the jeans/jacket, ensuring it doesn't appear "superimposed." PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute pixel preservation required for the user's face, neck structure, and hair. The neckline of the new shirt must align with the existing neck geometry without masking the Adam's apple or neck tendons. - **Body Integrity:** Strict prohibition on warping the user's torso width or shoulder breadth. The user's skin tone from the face/neck must be sampled and applied to the newly exposed forearms to ensure seamless biological consistency.