PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a woven textile, likely cotton or linen blend. Unlike the user's current tight-knit ribbed top, this material has structural stiffness and does not cling to the skin. It has a matte finish with low specularity. The simulation must account for crisp folding at the elbows and axilla rather than soft stretching. - **Key Features:** The asymmetrical white floral embroidery on the right shoulder/chest is a critical texture map that must be preserved without distortion. The collar structure, center button placket, and the cuffed/rolled sleeve ends must be retained. The "tucked-in" aesthetic of the source should be adapted to the target's jeans. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The garment must transition from a skin-tight fit (current) to a relaxed fit (target). A gap must be simulated between the user's torso and the fabric to represent the non-elastic nature of the cotton shirt. The collar must sit naturally around the neck base, standing slightly away from the skin, replacing the current scoop neck. The sleeve length should map to the source's 3/4 length, exposing the user's forearms. - **Occlusion Handling:** 1. **Phone & Left Hand:** The most critical occlusion. The yellow fabric must be rendered strictly *behind* the phone case and the grasping fingers. 2. **Hair:** The user's long dark hair draped over both shoulders must be masked and layered *on top* of the new yellow collar and shoulder embroidery. 3. **Right Hand:** The right hand is inside the jeans pocket. The hemline of the shirt must appear tucked into the jeans waistband to respect this geometry, or drape naturally around the wrist if untucked, ensuring the hand remains inside the denim, not the shirt. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The source image is in daylight/outdoor lighting, while the target is in a bedroom with warm, artificial ambient light and fairy lights. The bright yellow of the shirt must be color-graded to accept the warm (pink/orange) cast of the room. Specular highlights on the buttons must match the reflection of the fairy lights visible in the mirror. - **Color Calibration:** Reduce the high-contrast saturation of the sunlight source. Apply a subtle "warm filter" to the white embroidery so it does not appear stark white (fluorescent) against the warm room tones. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on the user's facial pixels, including the jawline and the neck area above the collar line. The hair texture and volume must remain untouched. - **Body Integrity:** The volumetric simulation of the loose shirt must not result in warping the user's underlying skeletal structure. Do not slim the waist or alter the hip width. The arm thickness must remain consistent with the user's biology, even where exposed by the shorter sleeves of the new garment.