PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a fitted, cropped tank top, likely made of a cotton-spandex blend or jersey knit. It has low specular reflectivity (matte finish) but high elasticity. The simulation must treat this as a stretch fabric that contours closely to the skin rather than hanging loosely. - **Key Features:** The central white butterfly graphic print is the primary visual anchor and must not be distorted beyond natural fabric stretch. The scoop neckline and the cropped hemline (ending above the navel) must be preserved. The denim jacket tied around the waist in the source image is an obstruction/accessory and must be disregarded; only the blue tank top is to be extracted. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's raised arm pose (specifically the "muscle flex" stance), the tank top straps must sit taut against the trapezius muscles without digging in unnaturally. The fabric across the chest needs to stretch horizontally. The hemline should lift slightly at the sides corresponding to the raised arms, exposing the midriff consistent with the user's current pose. - **Occlusion Handling:** The user has a high bun, meaning the neck and shoulder area is free of hair occlusion—this simplifies strap placement. However, the simulation must layer the garment *under* the existing wrist accessories (bracelets) if they cross the torso line (though they appear clear here). The garment must terminate cleanly at the waist, ensuring it does not overlap the waistband of the user's existing red patterned pants. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user is in a high-contrast, direct sunlight environment (beach setting) with a hard light source coming from the top-left. The source garment is currently lit by diffuse, overcast mountain lighting. We must introduce hard shadows onto the blue fabric, specifically casting shadows from the user's chin/neck onto the chest and self-shadowing under the bust area to match the beach's harsh lighting conditions. - **Color Calibration:** The source blue is cool-toned. It requires a warmer color grading adjustment to match the golden/yellow sunlight of the beach scene. The white butterfly graphic should reflect the ambient warm light, shifting slightly from pure white to a warm off-white. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze required on the user's face, sunglasses, earrings, and the hair bun. The neck and exposed skin of the upper chest (decolletage) not covered by the new tank top must remain pixel-perfect. - **Body Integrity:** Strictly forbidden to alter the user's arm circumference or waistline. The user's skin tone on the exposed midriff must remain original; do not generate new skin textures where the new top might reveal more skin than the old one—clone from adjacent skin pixels instead.