PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a cotton jersey knit. It possesses high flexibility and low structural stiffness. It must exhibit a matte finish with very low specularity (no shine). The physics engine must simulate soft, micro-folds rather than sharp creases. The white ribbed trim (neck and armholes) has slightly higher thickness and elasticity than the red body panel. - **Key Features:** The "NORTH CAROLINA 88" centered graphic with star motifs must be preserved without distortion. The contrasting white binding/piping around the neck and armholes is critical for defining the silhouette. The double-stitched bottom hemline must remain visible. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** * **Sleeveless Adaptation:** The current user is wearing a long-sleeved shirt. The simulation involves significant generative in-painting to reveal the user's deltoids, biceps, and triceps, as the new garment is a tank top. * **Torso Drape:** Due to the user's leaning pose (leaning slightly backward and to his left), the fabric must pull tight across the user's right pectoral and hang vertically loose on the user's left side (viewer's right). * **Waist Interaction:** The user's right hand is in his pocket. The tank top hem will likely drape *over* the wrist/watch area or bunch slightly just above the pocket entry, depending on the length calibration. - **Occlusion Handling:** * **Right Wrist/Watch:** The user's right wrist and watch (viewer's left) are currently interacting with the trouser waist. The new garment's hemline must settle naturally around this obstacle, ensuring the hand remains the top layer. * **Neck Area:** The current collar is high; the new scoop neck is low. The user's upper chest and neck skin must be generated where the black shirt collar currently occludes them. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The room utilizes soft, diffused overhead lighting (likely LED), creating soft shadows. The red fabric must absorb this light, showing a brighter red on the upper chest and darker, graduated shading towards the waist and under the armpits. Shadows must be cast by the garment onto the newly exposed skin of the arms. - **Color Calibration:** The source red is vibrant. It must be slightly desaturated and warmed to match the indoor color temperature of the user's room (which has warm wood tones and off-white tiles) to avoid looking like a superimposed graphic. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's beard, hair volume, facial structure, and skin tone on the face must be frozen. The head tilt and gaze direction must remain unaltered. - **Body Integrity:** Do not slim the waist or broaden the shoulders artificially. The volume of the chest and the width of the torso must remain consistent with the user's physique as defined by the original black shirt, simply replacing the cloth volume with the tank top's closer fit.