PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment appears to be a structured Cotton Poplin or Seersucker blend. It is a woven fabric with moderate stiffness, meaning it will hold the shape of the puff sleeves and peplum flare rather than draping heavily like jersey or silk. It has a matte finish, so specular highlights should be low, except for a subtle sheen on the white embroidery threads. - **Key Features:** The square neckline is a critical structural element that must replace the current V-slit. The "daisy" embroidery and the yellow/white gingham check pattern must maintain texture alignment without distorting the grid. The peplum waistline (gathered seam under the bust) and the short cap sleeves (adding volume to the user's currently bare shoulders) must be preserved. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is standing with a slight hip tilt to her right. The garment's waist seam needs to align with her natural high waist, sitting just above the waistband of the jeans. The peplum flare should drape naturally over the top of the jeans, reacting to the slight outward curve of her right hip where her hand is pocketed. The cap sleeves must generate volume around the deltoids, covering skin that is currently exposed. - **Occlusion Handling:** The user's long, wavy hair falling over her right shoulder and chest is the primary occlusion; the new fabric and right cap sleeve must be rendered *behind* this hair volume. The user's right wrist and watch are close to the hemline; the garment must settle behind the wrist if the hem drops that low, or hang freely above it. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user environment utilizes soft, high-key studio lighting simulating daylight, coming primarily from the front-left (viewer's left). Shadows on the new garment must cast softly toward the right side of the torso and under the bust/peplum seam. Self-shadowing must be generated inside the square neckline and under the cap sleeves. - **Color Calibration:** The source garment is a warmer, mustard-toned yellow compared to the user's current lemon-yellow top. The hue must be slightly desaturated or cooled to match the color temperature of the "sky" backdrop and the cool-toned denim, preventing the shirt from looking like a pasted asset. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze required on the user's face, jawline, neck, and ears. The hair silhouette must remain untouched. - **Body Integrity:** The user's shoulder width, arm thickness, and waist circumference must remain unaltered. The garment simulation must conform to her existing measurements, not slim her down to fit the hanger shape of the source cloth. The skin texture on the décolletage (exposed by the new square neck) must be preserved or seamlessly reconstructed from the surrounding skin data.