PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a heavyweight flannel with a thick sherpa (fleece) lining. It possesses high structural rigidity and substantial volume. Unlike the user's current thin t-shirt, this jacket should not cling to the skin. The exterior is matte cotton (low specularity), while the inner sherpa lining adds thickness to the collar and placket areas. - **Key Features:** - The white sherpa lining visible at the collar and inner lapel must be rendered with volumetric texture, not flat mapping. - The specific green/yellow plaid pattern alignment must be maintained across seams. - Silver snap buttons and the chest pocket flaps (with the small logo tag on the left pocket) must be preserved. - The structural collar stiffness must be maintained so it stands up slightly around the neck rather than lying flat like a t-shirt. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - Due to the rigid nature of the flannel and lining, the silhouette must expand outward from the user's current torso boundaries; the jacket adds bulk. - Significant creasing and bunching must be simulated at the inner elbows (antecubital fossa) where the user's arms are bent upward to hold the phone. - The hemline should hang straighter and lower than the current curved t-shirt hem, adhering to the jacket's stiffer drape. - **Occlusion Handling:** - **CRITICAL:** The user's hands (both left and right), the smartphone, and the wrist accessories (watch on left wrist, red thread/bracelet on right wrist) are high-priority occlusions. These elements must be masked and layered strictly *on top* of the rendered jacket. - The jacket's chest area must appear effectively "behind" the phone and hands. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** - The source image has harsh outdoor sunlight. This must be neutralized. - The target environment (User Image) has diffuse, soft indoor lighting, likely from a ceiling source and the mirror reflection. Shadows on the jacket must be soft and diffuse, matching the shading currently seen on the user's grey shorts. - Artificial shadows must be cast by the phone and hands onto the chest of the new jacket to ground the object in the scene. - **Color Calibration:** - The source jacket is highly saturated. The yellow and green tones must be slightly desaturated and cooled to match the white balance of the indoor user photo, ensuring the "black" values of the plaid shadows match the "black" values of the user's hair and phone screen. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's hair (including the texture), forehead, visible eyes, beard, and ear structure must be absolutely frozen. The geometric relationship between the neck and the jawline must remain untouched. - **Body Integrity:** Strict prohibition on body warping. The user's shoulder width and arm thickness must be preserved. The simulation must fit the cloth to the body, not warp the body to fit the cloth. The user's muscular build should translate through the jacket, not be flattened.