PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a cotton jersey knit (Adidas ringer tee). It has medium elasticity and a matte finish. Light behavior should be diffuse (absorbent) with soft highlight rolloffs, unlike the sheen of synthetic sports jerseys. The fabric weight is light-to-medium, meaning it will show moderate folding but will not drape heavily like wool. - **Key Features:** 1. **Three-Stripe Detail:** The three white stripes running down the shoulders/sleeves are structural constraints that must follow the arm geometry. 2. **Ringer Trim:** White ribbed contrast on the neck collar and sleeve cuffs. 3. **Logo Placement:** The Adidas Trefoil logo on the left chest must be positioned accurately relative to the clavicle, distorted slightly by the chest volume. 4. **Hem Tag:** The small white tag on the bottom left hem should be preserved if visible in the final crop. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Right Shoulder (Viewer's Left):** The arm is extended sideways. The fabric must stretch horizontally across the chest from the armpit, creating tension wrinkles pointing toward the neck. - **Left Shoulder (Viewer's Right):** The arm is raised and bent. The sleeve cuff must sit higher up the bicep, and the fabric must bunch/compress significantly at the top of the shoulder and armpit area. - **Waist Interaction:** The user is wearing high-waisted jeans. The new shirt has a straight hem. The simulation must calculate the collision with the denim waistband—either draping slightly over it or appearing partially tucked to match the user's current styling preference. - **Occlusion Handling:** - **Hair Masking:** The user has long, dark hair cascading over the left shoulder (viewer's right) and the right chest area. This hair layer is the primary occlusion and must be segmented and composited *over* the maroon fabric. - **Hand/Accessories:** The user's left hand (near the neck) and the bracelets on the left wrist must remain the top layer. The new shirt collar must sit *behind* the fingers if they overlap the neckline. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target scene has a strong, directional natural light source coming from the right (viewer's perspective), casting shadows to the left. - **Highlights:** The maroon fabric needs a brighter, warmer luminance on the left sleeve and shoulder (viewer's right). - **Shadows:** Deep shadows must be generated on the user's right side (viewer's left side of the torso) and underneath the bust. - **Color Calibration:** The source image has neutral, flat studio lighting. The target environment is warmer. The "Maroon" RGB values must be adjusted with a slight warm (yellow/orange) tint to integrate with the room's ambient temperature, preventing the shirt from looking like a "sticker." PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on the facial region (eyes, nose, mouth), specifically preserving the user's glasses and the natural skin tone of the face and neck. - **Body Integrity:** The user's arm volume and torso width must be preserved. The simulation must warp the Adidas shirt to fit *her* measurements; strictly NO warping or liquefying of the user's body to fit the shirt template. The waist-to-hip ratio must remain unaltered.