PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a heavyweight cotton-poly fleece blend (hoodie material). It possesses high structural integrity with low specular reflection (matte finish). The fabric physics simulation must account for a thickness of approximately 3-4mm, resulting in soft, rounded folds rather than sharp creases. It absorbs light softly. - **Key Features:** - **Graphic Integrity:** The "Enjoy Growing" / "Plant Based" multi-colored graphic print and vegetable illustrations must remain undistorted across the chest area. - **Structural Details:** The hood visible at the neckline, the long yellow drawstrings, and the ribbed elastic texture at the hem and cuffs. - **Silhouette:** The garment is an oversized/relaxed fit with a kangaroo pocket (though the pocket structure may flatten slightly without hands inside it). PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Given the target's slim build and the source's oversized nature, the simulation must exhibit a "drop-shoulder" effect. The fabric should drape loosely from the bust down, avoiding a tight contour around the waist. The hemline of the hoodie is long and will likely extend past the user's waist, potentially resting on the upper thigh or bunching slightly above the clasped hands. - **Occlusion Handling:** - **Hair:** The user's shoulder-length dark hair currently rests on her shoulders/chest. The new hoodie must be rendered *underneath* the hair layers. The hair segmentation mask is critical here. - **Hands/Wrists:** The user's hands are clasped low. The hoodie's hem or lower fabric bulk will interact with the wrists. The watch on the left wrist must either be occluded by the sleeve or the sleeve must bunch up slightly above it, depending on the sleeve length calculation. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target image features soft, diffuse indoor lighting coming primarily from the front-left, casting a soft shadow on the wall to the user's right. The virtual garment must generate a corresponding shadow on the wall to the right. The yellow fabric should not appear self-luminous; it needs to accept the ambient occlusion from the user's hair and chin. - **Color Calibration:** The source image has slightly warmer tones. The yellow of the hoodie must be desaturated slightly and color-balanced to match the cooler, neutral white balance of the target room. A subtle yellow color bleed (bounce light) should be calculated onto the user's lower jaw and neck area to integrate the object realistically. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire facial region (eyes, nose, mouth, jawline) and skin tone are frozen zones. No retouching or lighting alteration is permitted on the skin. - **Body Integrity:** The user's underlying skeletal structure and body volume must remain unchanged. While the hoodie adds volume *outward*, the simulator is strictly forbidden from narrowing the user's hips or legs to compensate for the larger top. The visible grey jeans and feet must remain untouched.