PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a structured, fleece-lined or heavy cotton zip-up vest. Unlike the user's current lace top, this material is opaque, matte, and relatively stiff. It will not cling to the skin but rather maintain its own shape, particularly around the high-neck collar and armholes. Light reflection should be diffuse with no gloss. - **Key Features:** The "Monstera" leaf pattern must maintain scale and not distort excessively across the zipper line. The central zipper mechanism, the structural stitching at the hem, and the standing collar are non-negotiable details. The slit pockets (distorted in the source image by the model's hand) must be reconstructed to lie flat. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's seated pose, the vest will behave differently than the standing reference. The fabric must bunch slightly at the lower abdomen where the torso compresses. The hemline will not hang straight; it will rest upon the user's upper thighs/hips, likely flaring slightly outward or buckling due to the contact with the jeans. The armholes must align with the user's shoulders without the fabric digging into the axilla. - **Occlusion Handling:** The user's hands are clasped on her lap; the bottom hem of the vest may partially interact with the wrists/forearms depending on the garment length. The user's long hair falls behind the shoulders, but the new high collar will interact with the neck area—the collar must appear to wrap *around* the neck, sitting in front of the hair at the nape. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user's environment has cool, diffuse indoor lighting (likely fluorescent) with soft shadows falling downwards. The source garment is studio-lit. We must lower the exposure and contrast of the vest, introducing a slightly cool/cyan cast to match the ambient room tone. Shadows must be generated under the collar onto the neck and under the hem onto the blue jeans. - **Color Calibration:** The crisp sage green and black of the source must be slightly desaturated and grain-matched to align with the "Realme 8" sensor noise seen in the target image. The source blacks (if transferring sleeves) or the green vest shadows must match the black levels of the background bed frame. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire face (eyes, nose, mouth, jawline) and the specific hairstyle (pulled back with loose flyaways) are frozen. The neck area below the chin must be carefully masked where it meets the new collar. - **Body Integrity:** The simulation is strictly forbidden from slimming the user. The fleece vest adds bulk compared to the thin lace top; the final render must reflect this added volume naturally. The arm thickness (which needs skin-texture generation to replace the lace sleeves, unless the black under-sleeves are transferred) must match the user's anatomical proportions.