PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard cotton jersey. It has a matte finish with low reflectivity and medium weight. The simulation must avoid any sheen; light absorption should be high. The drape needs to be soft but structured enough to hold the boxy shape of the t-shirt, avoiding the "clingy" look of spandex. - **Key Features:** The central text "MORE THAN A SUPER HERO" must remain centered on the chest and readable, warping only slightly with body curvature. The white tie-dye bleach pattern on the green base must be preserved. The ribbed crew neck collar structure and the double-stitched hemline are essential details to maintain realism. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user has her arms raised and bent at the elbows. The virtual garment's shoulders must lift slightly in response to this deltoid movement. Unlike the current form-fitting crop top, the target T-shirt is a loose fit; it must drape vertically over the currently exposed midriff and extend past the waistband of the pants. Significant tension wrinkles and folding should generate around the armpits (axilla) due to the raised arm pose. - **Occlusion Handling:** The user's hair is in a top knot and does not obscure the shoulders, simplifying the neckline transfer. However, the simulation must strictly layer the new t-shirt *over* the existing torso skin and the top edge of the patterned pants. The user's sunglasses and wrist accessories must remain completely unaffected. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The scene features harsh, natural sunlight coming from the viewer's right (User's left), casting hard shadows to the left. The green t-shirt must be illuminated brightly on the right side, with deep, high-contrast shadows casting into the fabric folds on the left side. - **Color Calibration:** The source image has neutral studio lighting. The green and white tones of the shirt must be color-graded to match the warm, sunny ambient temperature of the beach setting. The white bleach marks should pick up a slight warm/yellow tint from the sunlight rather than remaining sterile white. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** A rigid mask must be applied to the user's entire head, including the bun, sunglasses, nose, mouth, and jawline. The neck area above the new crew collar must also be frozen. - **Body Integrity:** The algorithm is strictly forbidden from altering the user's arm thickness or waist width. While the midriff will be covered, the volumetric shape of the torso must match the user's original anatomy, not the mannequin's shape. Skin tone on the exposed arms and chest area above the collar must remain unchanged.