PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a cotton jersey blend. It has a matte finish with low light reflectivity and high light absorption. The simulation must treat the fabric as soft and pliable with medium weight, distinct from the stiffer knit structure of the user's current zipped sweater. - **Key Features:** The "LOS ANGELES" arched outline text and "CALIFORNIA" subtext are critical fiducial markers; warping must preserve their legibility despite the torso angle. The crew neckline and the rolled/stitched hem of the short sleeves must be rendered clearly. The specific chocolate/mocha brown hue must be preserved against the high-exposure background. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Right Arm (Raised):** Due to the arm being raised to touch the cap, the right sleeve of the t-shirt must slide down towards the shoulder joint due to gravity, rather than sticking to the bicep. Fabric tension wrinkles should radiate from the right armpit across the upper chest. - **Torso:** The t-shirt is looser than the current ribbed sweater. It should hang vertically from the chest down, creating a slight gap between the fabric and the lower back/stomach area. - **Arm Generation:** Since the user is wearing long sleeves and the target is short-sleeved, the simulation must generatively in-paint skin texture on the forearms and biceps to match the facial skin tone. - **Occlusion Handling:** The user's chin is tucked downwards; the neckline of the t-shirt must sit *under* the chin shadow/beard line. The cap held in the hand and the hand itself are separate objects and must remain layered *above* any potential sleeve rendering. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The scene utilizes bright, harsh outdoor sunlight coming from the upper right (relative to the camera). The new garment must exhibit high-contrast shadows. Specifically, the raised right arm will cast a hard shadow onto the right shoulder/chest area of the brown t-shirt. - **Color Calibration:** The source cloth image is cool-toned/studio lit. The target environment is warm, outdoor daylight. The brown of the t-shirt must be color-graded warmer (increased amber/yellow values) to match the ambient light of the lake scene, preventing it from looking like a "sticker." PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's face, downward gaze, facial hair, and ears must be masked and frozen. The beige cap being held must not be altered or textured over. - **Body Integrity:** Strict prohibition on altering the user's shoulder width or stomach profile. The transition from the new t-shirt hem to the existing brown trousers must be seamless, maintaining the user's current waistline position without slimming the hips.