PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source is heavyweight, rigid denim. Unlike the user's current flowy cotton t-shirt, the vest must maintain structural integrity and not cling to the body contours. Light reflection should be matte with high-frequency texture noise (twill weave), while the metal buttons require high specular highlights. - **Key Features:** The sleeveless frayed armholes are critical; the simulation must not generate sleeves. Preserve the "distressed" rips on the upper chest panels, the distinct collar stiffness, the vertical structural seams, and the metallic sheen of the front buttons and chest pocket rivets. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's slight slouch and raised left arm, the left armhole of the vest must distort upwards naturally without stretching the texture. The collar should sit higher on the trapezius than the current t-shirt crew neck. The garment must hang straight down from the chest peak, creating a gap between the fabric and the user's abdomen (box fit), rather than draping inward. - **Occlusion Handling:** The silver chain necklace sits on the neck and must be layered *over* the vest or properly occluded by the new collar. The user's left hand touches the cap, but the forearm is clear of the torso; however, the left bicep moves into the armpit area, requiring precise masking at the vest's armhole. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user scene utilizes soft, diffuse studio lighting (cool-toned, largely shadowless). The white denim must be rendered with soft ambient occlusion in the seams and under the pocket flaps. Shadows should be subtle and grayish-blue to match the environment, avoiding high-contrast black shadows. - **Color Calibration:** The source white is bright; it must be slightly desaturated and color-graded towards a cool grey-white to match the user's background and lighting temperature, preventing the vest from looking "pasted on" or over-exposed. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The entire head, including the face, ears, and the cap (brim and crown), must remain pixel-perfect frozen. - **Body Integrity:** The user's arm tattoos (left arm) are a critical biometric feature and must be preserved completely. Do not slim the user's torso; the vest adds material thickness, so the silhouette should naturally expand slightly outward compared to the skin/t-shirt, preserving the user's lean build without artificial warping.