PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a lightweight cotton jersey. Unlike the user's current stiff woven button-down, this material has high pliability and low bending resistance. It acts as a diffuse reflector with a matte finish; it should not exhibit specular highlights. The drape must be soft, avoiding the sharp, angular creases seen in the current black shirt. - **Key Features:** The "ROAD TRIP" typography and Scooby-Doo van graphic are the primary focal points and must undergo non-rigid deformation (warping) to match the chest curvature without losing legibility. The lime green crew neck ribbing must replace the current open collar. The short sleeve hemline is a critical boundary that differs from the current long sleeves. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's pose (leaning right, hip cocked), the jersey fabric must pull tighter across the left shoulder and drape loosely toward the right hip. Gravity will cause the fabric to hang vertically, diverging from the user's tapered waistline relative to the tucked-in shirt. Since the target is changing from long sleeves to short sleeves, the simulation must infer and generate natural skin texture and arm volume for the currently covered forearms and elbows. - **Occlusion Handling:** - **Right Arm:** The wrist watch and hand are currently interacting with the trouser pocket. The new short sleeve will end mid-bicep; the forearm must be generated to connect the sleeve to the existing hand/wrist. - **Waistline:** The current shirt is tucked; the new t-shirt should ideally simulate a "French tuck" or hang naturally over the belt line to mask the transition, as the source garment is casual. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features diffuse, overhead indoor lighting (likely LED), casting soft shadows downwards and slightly to the viewer's right. The lime green albedo is high; it must be adjusted to accept the room's ambient occlusion without appearing "radioactive." Self-shadowing within the t-shirt's folds must match the density of the shadows under the user's chin. - **Color Calibration:** The source image is studio-lit (neutral/cool white). The target room has warmer, slightly yellowish tones. The lime green must be color-graded (slightly warmed and desaturated) to integrate with the room's color temperature and preventing a "cut-and-paste" sticker effect. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute pixel preservation required for the head, including the beard, mustache, hair volume, and neck up to the Adam's apple. The gaze and jawline definition must remain untouched. - **Body Integrity:** The user's shoulder width and deltoid volume must be maintained. Do not apply slimming filters. The generated skin for the arms (revealed by the short sleeves) must match the pigmentation and grain of the user's face and neck.