PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source is a heavyweight, rigid white denim. Unlike the current clingy cotton t-shirt, this material possesses high bending resistance. It must not conform tightly to the pectorals or abdominals but rather maintain a structural, boxy shape. The surface is matte with a slight texture, while the metal buttons require high specular reflection to mimic hard hardware. - **Key Features:** The structured collar (must replace the current crew neck), the two breast pockets with button closures, the specific distress/rip marks on the upper chest yoke, and the raw/hemmed edges of the sleeveless armholes must be preserved. The vertical button placket must remain straight, only deforming slightly with the body's twist. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's pose (Right Arm raised), the vest's right shoulder yoke must lift significantly, creating a gap/opening at the right armhole. The left side will hang closer to the body due to gravity. The vest acts as a shell; it should bridge over the waist indentation rather than tucking in. Crucially, because the source is sleeveless and the target wears a t-shirt, skin texture generation is required to replace the maroon sleeves on the deltoids and biceps. - **Occlusion Handling:** The user's hands are clear of the torso, simplifying chest mapping. However, the chin casts a shadow that must be re-projected onto the new collar. The cap and the user's right hand touching the cap are strictly background/foreground elements and must not interact with the cloth simulation. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The scene features a strong, hard directional light source coming from the viewer's left (user's right), casting a sharp shadow on the wall to the right. The white denim must be illuminated brightly on the left side, graduating to self-shadowing on the right side. - **Color Calibration:** The user's environment has a warm, yellow/beige ambient cast. The stark white of the source vest must be color-graded with a slight warm undertone to prevent it from looking bluish or clinically white, ensuring it blends with the studio's warm temperature. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's face, neck structure, ear, and the beige cap must remain pixel-frozen. The skin tone on the neck must be sampled to accurately generate the new skin required for the exposed arms (due to the sleeveless transfer). - **Body Integrity:** The user has a muscular build. The simulation is explicitly forbidden from slimming the waist or compressing the chest. The vest must sit *on top* of the current physiological volume, naturally adding slight bulk due to the fabric thickness.