PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment appears to be a medium-weight opaque cotton or linen blend with a matte finish. It has low specularity (does not shine) but high structural integrity, holding its shape at the collar and sleeves rather than draping like liquid. The embroidery thread should have a slightly higher reflective index than the black base fabric, catching subtle highlights. - **Key Features:** The distinctive "Cuban collar" (open camp collar) must replace the current crew neck. The vertical white floral embroidery running parallel to the placket, the zigzag white stitching on the hem and sleeve cuffs, and the visible black buttons are critical design elements. The shirt is a relaxed/boxy fit. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is standing with a slight twist to his right. The shirt's button line must follow the centerline of his torso, slightly angled. Because the user's hands are in his pockets, the lower side seams of the shirt must be simulated to push back behind the forearms or bunch slightly at the wrist contact point, rather than hanging straight down. The shoulders should drop slightly off the user's natural shoulder line to maintain the garment's relaxed fit. - **Occlusion Handling:** The user's hands and wrists are the primary occlusion zones. The shirt hem must interact with the wrists—either draping over the top of the wrist bone or being pushed back by the forearm entry into the pocket. The user's neck and upper chest skin must be reconstructed where the current white t-shirt covers them, as the new garment has a deeper V-neck opening. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user environment is a high-key studio setting with soft, diffuse, cool-toned white lighting coming from the upper front-left. The source garment, currently in warm/yellow light, must be neutralized. Shadows cast by the new collar onto the user's chest must be soft and diffuse to match the shadow under the user's chin. - **Color Calibration:** Desaturate the warm yellow cast from the source image. The black fabric should be rendered as a neutral deep charcoal/black (RGB ~20,20,20) rather than a warm black. The embroidery must be corrected to a crisp white to match the user's sneakers and current t-shirt brightness levels. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head, including the specific volume of the curly hair and facial structure, must remain pixel-perfect. The skin tone on the neck must be preserved and extended naturally into the new open-collar area. - **Body Integrity:** Strictly maintain the user's shoulder width and arm muscularity. Do not slim the torso. The volume of the jeans and the position of the legs must remain untouched; the new shirt should simply layer over the waistband of the jeans without warping the denim texture.