PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment appears to be a cotton or cotton-linen blend with a matte finish. It possesses medium stiffness—sufficient to maintain the structural volume of the puff sleeves but soft enough to drape vertically without rigid creasing. It should scatter light diffusely (low specularity) rather than reflecting it sharply. - **Key Features:** The specific block-print pattern (blue/red motifs on olive green) must remain undistorted. The V-neckline geometry, the volumetric "puff" structure of the elbow-length sleeves, and the tunic length (extending below the hips) are critical design elements to preserve. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Unlike the user's current tucked-in shirt, the source is a long tunic. In the seated pose, the lower hem of the tunic must naturally pool or fold where the user's torso meets her thighs/lap. The fabric should drape loosely over the stomach area, respecting gravity, rather than hugging the waistline. **Crucial:** The source sleeves are shorter (elbow-length) than the user's current long sleeves; realistic skin texture must be generated on the forearms to replace the removed black fabric. - **Occlusion Handling:** The user's long dark hair falls over both shoulders and the chest; this hair mask must be segmented and layered *over* the new green tunic. The white handbag in the lap acts as a hard occlusion layer; the tunic's lower hem must tuck behind or bunch on top of the bag, not ghost through it. The watch on the left wrist must remain visible. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user image features strong, warm, directional sunlight coming from the back-right (creating a rim-light effect on the hair). The new garment must render with warm, golden-hour highlights on the right shoulder (viewer's left) and cast softer, cooler shadows towards the torso center and left side. - **Color Calibration:** The neutral studio lighting of the source cloth must be warmth-shifted to match the outdoor color temperature. The contrast of the pattern needs to be slightly reduced to match the softer, atmospheric contrast of the outdoor setting. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's facial structure, including the jawline, glasses, and specific expression, must remain frozen pixel-perfect. - **Body Integrity:** The user's shoulder width and seated posture must not be altered. Do not artificially slim the waist or remove the natural fold of the body at the hip crease created by the sitting position.