PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment appears to be a textured weave, likely a heavy cotton pique or linen blend. It has a matte finish with high surface friction, unlike the smooth sheen of the user's current denim. The simulation must treat this as a medium-weight fabric that holds its shape but possesses a softer, more porous drape than starched cotton. - **Key Features:** - **Texture:** The distinct micro-weave/grain of the fabric must be preserved and scaled correctly to the user's body size. - **Hardware:** The contrasting dark buttons must be retained. - **Artifact Removal:** The large black retail tag and yellow size sticker on the collar must be digitally excised. - **Structure:** The collar is soft-rolled, not stiff; this relaxation must be maintained. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Leaning Pose Physics:** The user is leaning backward against a ledge. The virtual fabric must react to gravity by falling vertically from the chest peak, potentially creating a slight gap between the fabric and the lower abdomen. It should not "paint" onto the stomach but hang naturally. - **Sleeve Transition:** The source is a short-sleeve shirt, while the user is wearing a rolled long-sleeve shirt. The system must generate/inpaint realistic skin texture for the user's forearms where the denim sleeves currently exist. - **Shoulder Tension:** With arms spread wide to grip the ledge, the fabric should exhibit slight tension lines radiating from the armpit to the collarbone. - **Occlusion Handling:** - **Neckwear:** The silver chain necklace must be segmented and layered *over* the new garment's neckline. - **Wrists/Hands:** The watch (left wrist) and beaded bracelet (right wrist) must be preserved. Since the new sleeves are shorter, these accessories will be fully visible and must not be obscured by the new garment geometry. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment uses cool, diffuse overhead office lighting (fluorescent/LED). The source image has warmer, directional home lighting. The source texture must be neutralized and relit to match the cool ambient light of the office. Shadows must be soft and cast downward-left, consistent with the shadows under the cabinet ledge. - **Color Calibration:** The pink/salmon hue of the source shirt will interact with the green ambient bounce from the glass wall behind the user. A subtle desaturation and slight green-tint/cool-shift in the occlusion shadows of the shirt are required to ground the garment in the scene. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute pixel preservation required for the face, hair, and neck structure. The jawline shadow casting onto the collar area must be recalculated for the new neckline height but the jaw itself must remain untouched. - **Body Integrity:** The user's midsection and posture (leaning back) must remain unaltered. Do not apply "slimming" filters or vertical straightening. The shirt must warp to the body's leaning angle, not the body to the shirt.