PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a medium-weight knit (likely a wool or acrylic blend) with a fuzzy, soft texture (low specularity/matte finish). Unlike the user's current tight elastane top, this material has significant structural thickness and stiffness; it absorbs light rather than reflecting it. The simulation must render individual fiber fuzz (halo effect) along the edges to demonstrate the knit texture. - **Key Features:** The central white "bow" intarsia graphic is the primary focal point and must maintain aspect ratio without warping across the chest curvature. The ribbed crew neckline, ribbed cuffs, and ribbed bottom hem must be distinct from the main body. The "H&M" tag inside the neck should be removed during mapping. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The target fit changes from "body-con/tight" (current state) to "relaxed/boxy" (new state). The sweater should hang vertically from the shoulders, creating a slight air gap between the fabric and the user's torso, specifically around the waist area. The hemline should fall lower than the current crop top, likely covering the waistband of the jeans. The sleeves must appear looser, showing natural folds at the elbow bend and bunching slightly at the wrists due to the ribbed cuffs. - **Occlusion Handling:** CRITICAL: The user's long dark hair falls heavily over the left shoulder and chest (viewer's right). A high-precision segmentation mask must separate the hair strands. The new sweater texture must be generated *underneath* the hair layer. The facial stickers and chin area must remain the top-most layer. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user's room has a mix of cool ambient light (blue walls) and a warm overhead source (ceiling fan/light). The studio-lit brightness of the source sweater must be reduced to match this indoor exposure. Shadows should cast downward from the neckline and hair onto the chest area of the sweater. - **Color Calibration:** The "pure white" of the bow needs to be color-graded to a slightly warmer, off-white tone to match the room's white balance (referencing the photo frame background) to prevent it from looking like a superimposed sticker. The red saturation should be slightly desaturated to blend with the blue-dominant environment. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on the facial region, specifically preserving the digital stickers (Shin-chan characters) on the cheeks and the skin tone of the neck. - **Body Integrity:** Zero structural changes to the user's underlying anatomy. The hips and visible portions of the jeans must remain untouched. The silhouette will naturally expand due to the sweater's bulk; do not artificially slim the waist to compensate for this added fabric volume.