PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard cotton jersey knit. It possesses low reflectivity (matte finish) and moderate pliability. It should absorb light rather than reflect it. The simulation must account for the fabric's tendency to create soft, rounded folds rather than sharp, angular creases found in stiffer materials. - **Key Features:** The large, central "ROAD TRIP" graphic with the Scooby-Doo Mystery Machine illustration is critical; its placement must remain centered on the chest despite the torso rotation. The lime green hue, the ribbed crew neckline, and the hem stitching on the sleeves must be preserved. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's seated, forward-leaning posture, the fabric physics engine must simulate significant bunching and transverse folding across the lower abdomen/lap area. Because the user is reaching across his body with his right arm, tension lines must radiate from the left shoulder toward the right armpit, while the fabric on the right side of the chest will compress and fold. - **Occlusion Handling:** The user's right hand and forearm are actively crossing the torso. The virtual garment must be rendered strictly firmly *behind* the right arm and hand. The user's beard creates a minor occlusion at the neckline that must be layered over the new collar. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features diffuse, soft daylight, likely in a shaded outdoor area, resulting in low-contrast shadows. The lighting is cool-toned due to the blue walls. The new garment must cast soft ambient occlusion shadows on the user's arms and neck, specifically under the crossed right arm. - **Color Calibration:** The source image uses high-intensity studio lighting. The lime green of the shirt must be desaturated slightly and color-graded with a subtle cool/cyan tint to integrate with the ambient light reflected from the surrounding blue masonry, preventing the shirt from appearing artificially fluorescent. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's side profile, ear, hair volume, and beard texture must be masked and frozen to prevent any AI hallucination or distortion. - **Body Integrity:** The user's seated posture naturally expands the midsection; this volume must be maintained. Do not apply slimming filters or alter the muscle definition of the exposed forearms. The pose mechanics (the bend of the wrist and fingers) must remain untouched.