PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a ribbed knit cotton jersey blend. It possesses high elasticity and matte reflectivity. The simulation must treat it as a semi-structured soft body that clings to the torso without stiff folding; it absorbs light rather than reflecting it (low specularity). - **Key Features:** The horizontal pastel stripe pattern (mint, yellow, peach, white) must maintain alignment despite body curvature. The crew neckline binding, armhole piping, and the subtle vertical ribbing texture are critical details. The cropped hemline is straight and must not look frayed. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** This is a "Sleeve-to-Sleeveless" transformation. The simulation must accurately generate skin texture for the user's currently covered arms while mapping the tank top to the torso. The garment should follow the contour of the user's bust and waist, terminating at the midriff (cropped length), potentially exposing the navel area above the high-waisted jeans. Gravity will cause the fabric to sit flush against the skin with minimal bunching due to the tight fit. - **Occlusion Handling:** The user has long, thick dark hair cascading over both shoulders and the chest. This is a primary obstruction. The hair MUST be segmented and layered *over* the new garment. The generated skin on the arms and the new neckline must pass behind the existing hair strands. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user's environment has a cool, cyan-tinted ambient light with a top-down artificial source (ceiling fan). The bright, neutral studio lighting of the source garment must be adjusted. The pastel colors need to be slightly desaturated and tinted cool/cyan to blend with the room's atmosphere. Shadows should be soft and cast downward from the bust line and hair. - **Color Calibration:** Reduce the luminance of the pastel stripes to match the exposure of the user's jeans. Avoid "glowing" artifacts; the white stripes on the shirt should not be brighter than the white of the ceiling fan in the background. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's facial features, jawline, and the digital stickers (Shin-chan on cheeks/forehead) must be frozen and pixel-preserved. - **Body Integrity:** Strict prohibition on body warping. The user's arm volume (currently defined by the red sleeves) must be translated to bare skin without slimming the limbs. The waistline width must remain constant, respecting the user's natural silhouette.