PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a black, sleeveless tank top, likely made of cotton jersey or a modal blend. It possesses a matte finish with low light reflectivity and high light absorption. The physics engine must simulate a "medium weight" drape—soft enough to fold gently but structurally sound enough to not cling like spandex. It should lack the sheen of synthetic fibers. - **Key Features:** The round "U" neckline and wide shoulder straps are critical and must replace the target's current high-neck halter geometry. The garment is a solid black with no texture (unlike the ribbed target top). The relaxed fit through the torso must be preserved, contrasting with the tight fit of the user's current top. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The new garment has a standard tank top cut, which covers the shoulders more than the current halter top. The fabric must sit naturally on the clavicles and drape downwards with gravity, slightly bridging the gap between the bust and the waist rather than hugging the skin tight. The hemline should appear to interact with the high-waisted skirt, implying a tucked-in fit or cropping at the waistband to match the user's styling. - **Occlusion Handling:** This is a high-complexity occlusion scenario. 1. **Hair:** The user's wavy hair falls over both shoulders and the upper chest. The new tank top straps must be rendered *underneath* the hair strands. 2. **Arms/Hands:** The user's right arm is crossed over the torso, and the left hand is grasping the right arm. The fabric simulation must stop at these boundaries; the arms and hands must be layered *over* the black tank top. 3. **Tattoos:** The tattoo on the left forearm and right wrist must remain fully visible and unaltered. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user environment utilizes soft, high-key studio lighting, predominantly frontal but slightly favoring the left side (indicated by shadows on the right side of the neck). The black fabric must not be rendered as pure black (#000000) but must feature soft, dark grey highlights on the left bust and shoulder to define the volume and wrinkles of the cloth. - **Color Calibration:** The black levels of the new top must be calibrated to match the black levels of the user's existing skirt. This ensures the top and bottom look like they exist in the same lighting environment. Avoid a "washed out" grey look; keep the contrast high. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head, including the sunglasses, earrings, jawline, and neck structure, must remain pixel-perfectly frozen. - **Body Integrity:** Strictly forbid any slimming of the arms or waist. The user's skin tone (where exposed on the arms and upper chest) must be preserved. The tattoos on the arms are unique identifiers and must not be blurred or covered by simulation artifacts.