PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a synthetic athletic mesh (likely polyester jersey). It features a micro-perforated texture that is matte but has a specific low-gloss specular highlight typical of sportswear. It is lightweight with medium pliability—it will not hold rigid creases like starched cotton, nor will it pool like silk. It has a slight "bounce" to its drape. - **Key Features:** The large, textured appliqué embroidery (silver/purple "sun" on the right chest and yellow ribbon-style "sun" on the left lower flank) must retain its 3D relief and not look like a flat print. The open "camp collar" structure, the front button placket, and the hem stitching are critical. The distinct mustard-yellow hue must be preserved. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is currently wearing a bulky knit sweater. The simulation must estimate the skin surface *beneath* the sweater to ensure the yellow shirt fits the actual body, not the silhouette of the sweater. The shirt is short-sleeved, while the user wears long sleeves; the simulation must drape the sleeves loosely around the biceps, allowing them to hang naturally vertically due to gravity, rather than hugging the arm. The shoulders should align with the user's natural shoulder line, dropping slightly for a relaxed fit. - **Occlusion Handling:** The user's full beard is the primary occlusion layer. The collar of the new shirt must be rendered *behind* the beard hairs. The chin area and the bottom of the turban must remain the topmost layer, ensuring the shirt does not clip through the facial hair. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment (cinema lobby) has strong, warm artificial overhead lighting, creating a diffuse ambient glow with specific highlights reflecting off the floor. The source shirt, currently lit by flat flash photography, needs to adopt the warm color temperature of the cinema lights. Shadows on the shirt should be cast downwards, consistent with the ceiling lights, and be soft rather than harsh. - **Color Calibration:** The mustard yellow of the shirt must be color-graded to interact with the warm indoor lighting. It should pick up slight reflections from the surrounding bright posters and the warm beige floor, shifting slightly towards a warmer amber tone rather than the cool yellow of the source image. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's turban, eyes, nose, skin tone, and distinct full beard must be completely frozen. The boundary between the beard and the neck/collar area requires high-precision masking to prevent texture bleeding. - **Body Integrity:** The user's shoulder width and torso volume must be maintained. Do not slim the user or alter the posture. Since the user is transitioning from a thick sweater to a thin shirt, the visible volume will naturally decrease slightly, but the underlying skeletal structure and body mass must remain unaltered.