PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a lightweight cotton jersey knit. It possesses a matte finish with low specularity (no shine). The simulation must treat the material as having medium pliability—soft enough to fold naturally under gravity but structured enough to hold the crew neck shape without collapsing. - **Key Features:** The central "ROAD TRIP" typography and "Mystery Machine" graphic are non-negotiable anchors; they must warp correctly around the chest volume without pixelation. The lime green hue is the primary color value. The crew neck hem and standard short-sleeve stitching lines must be preserved. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is standing with the right arm (viewer's left) extended to hold a railing and the torso slightly angled. The fabric simulation must reflect tension across the right pectoral and shoulder due to the arm lift. The graphic print must experience cylindrical warping to match the user's chest curvature rather than appearing as a flat 2D overlay. The hemline should hang naturally, slightly uneven due to the hip placement, matching the untucked drape of the original white shirt. - **Occlusion Handling:** The primary occlusion layer is the green metal railing in the foreground; the shirt must be rendered *behind* this railing in Z-depth. The user's left arm (viewer's right) is close to the body; the sleeve must sit naturally without clipping into the forearm or the wristwatch. The neck/beard area is clear, but the collar must sit below the beard line. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features harsh, high-contrast natural daylight (sunlight) coming from the upper right. The source garment's flat studio lighting must be replaced with this dynamic outdoor lighting. Hard shadows must be generated under the pectoral muscles, under the neck/chin, and heavily along the left side of the torso (viewer's right) where the arm blocks the sun. - **Color Calibration:** The lime green albedo must be influenced by the warm sunlight temperature. Highlights on the shoulders should shift towards a warm yellow-green, while shadows in the folds should be deeper and cooler to match the ambient occlusion of the waterfall environment. Global illumination is required to cast a subtle green color spill onto the inner arms and neck. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on the user's face, including the cap, sunglasses, beard, ears, and neck structure. The transition from the new collar to the existing neck skin must be seamless. - **Body Integrity:** Strict prohibition on warping or slimming the user's torso. The garment must expand to fit the user's existing chest and waist measurements. The user's skin tone on the arms and visible neck area must remain unaltered.