PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a black short-sleeved Henley, likely a cotton-pique or waffle-knit blend. It has a matte finish with low specularity (it absorbs light rather than reflecting it). The simulation must treat this as a medium-weight fabric with moderate tensile strength—it should not cling like spandex nor stand rigid like heavy denim. - **Key Features:** The Mandarin/band collar is the primary structural element that must be preserved. The 3-button placket (with top buttons unfastened) provides vertical orientation. The rolled/hemmed cuffs on the sleeves are essential for defining the silhouette. The deep black color must retain texture detail (knit grain) to avoid looking like a flat black void. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's raised right arm (drinking pose), the physics engine must calculate significant tension lines radiating from the right axilla (armpit) diagonally across the pectorals towards the left hip. The right sleeve will not sit at the bicep; gravity dictates it must slide down towards the shoulder joint, bunching slightly at the deltoid. The hemline on the user's right side should be pulled upward, exposing the belt line, while the left side hangs lower. - **Occlusion Handling:** The user's right hand, wrist, and the black wristband/watch are technically above the garment level, but the sleeve will likely retract below them. The critical occlusion occurs at the neck: the user's beard and jawline must layer *over* the new Mandarin collar. The water bottle and hand must remain the top-most visual layer. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment is outdoors under an overcast/diffused sky. Lighting is soft, omnidirectional, and cool-toned. The black shirt must not be rendered in "studio black"; it requires a "lifted black" adjustment with cool/blue ambient skylight reflection on the upper folds (shoulders/chest) to match the atmospheric perspective. - **Color Calibration:** Apply a slight desaturation and exposure lift to the source garment. The highlights on the fabric folds should align with the cool temperature of the sky (approx. 6500K-7000K), moving away from the warm studio lighting of the source image. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze required on the user's profile geometry: forehead, nose, eyes, ear, and the complex interaction of the mouth on the bottle. The beard shape must remain untouched where it meets the neckline. - **Body Integrity:** Strict prohibition on warping the user's midsection or arm thickness. The garment must drape over the existing abdominal curve and bicep volume without slimming or athleticizing the target's physique. The skin tone of the raised arm must be preserved exactly as is.