PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a medium-weight knit (likely acrylic or wool blend). Unlike the current stiff cotton shirt, this material has high internal friction and low specular reflection. It must render with a matte, fuzzy surface texture (sub-surface scattering) rather than sharp shine. - **Key Features:** The ribbed crew neckline, ribbed wrist cuffs, and ribbed bottom hem are structural anchors that must remain distinct. The "glitch" style vertical pattern (lime green and black) must maintain its pixelated integrity without blurring during wrapping. The drop-shoulder seam construction must be preserved to maintain the oversized aesthetic. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The source sweater is a relaxed/loose fit compared to the user's current slim-fit shirt. The simulation must add volume to the torso silhouette to represent the thickness of the knit. The fabric should accumulate slightly at the waist due to the ribbing, rather than hanging perfectly flat. - **Occlusion Handling:** - **Left Hand (Chest):** This is critical. The user's left hand is currently grasping a placket. Since the new garment is a solid pullover, the simulation must render the knit fabric *underneath* the fingers. The fabric should show slight compression/indentation where the fingers press against the chest. - **Right Arm (Pocket):** The sweater hem on the right side must bunch or fold naturally around the wrist where the hand enters the trouser pocket. - **Neck:** The sweater has a higher crew neck than the open collar shirt; it will cover more of the lower neck/clavicle area. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user image features soft, directional daylight coming from the left (viewer's perspective), casting shadows to the right. The lime green elements of the sweater must be brightest on the left shoulder and torso, fading into deeper shadow on the right side. - **Color Calibration:** The studio white balance of the cloth image is neutral/cool. The user's environment has a slightly warmer, indoor ambient tone. The neon green intensity needs to be slightly desaturated and harmonized with the room's white point to prevent the "glowing sticker" effect. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head, including the beard, hairstyle, ears, and skin tone above the neckline, must be frozen. The neck area visible *above* the new crew neck must remain unaltered. - **Body Integrity:** Strictly forbidden to slim the waist or broaden the shoulders artificially. While the silhouette will expand outward due to the sweater's thickness, the user's skeletal landmarks (shoulder width, arm length) must remain the anchor points.