PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a cotton jersey knit. It possesses a matte finish with low specular highlights. The simulation must calculate a medium-weight drape—heavier than the user's current chiffon/lightweight top, but flexible enough to fold softly without rigid creasing. - **Key Features:** - The white "Three Stripes" piping on the raglan/shoulder area must follow the curvature of the shoulder. - The white "Trefoil" Adidas logo on the left chest must be preserved and warped perspectively to match the user's 3/4 torso rotation. - The contrasting white ringer neckline and sleeve cuffs must maintain distinct, clean edges against the maroon fabric. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Sleeve Generation:** Since the user is wearing a sleeveless top, the simulation must generate volumetric sleeves over the bare upper arms. - **Torso Rotation:** The user is angled in a 3/4 profile. The garment's centerline must shift to the viewer's right to align with the sternum, causing the logo to appear slightly foreshortened. - **Tension Points:** The fabric should pull slightly tight across the bust and shoulder blades due to the rotation, while hanging looser at the lower back (lumbar region). - **Arm Bend:** The user's left arm is bent at 90 degrees. The left sleeve of the t-shirt should bunch slightly at the inner elbow/axilla region. - **Occlusion Handling:** - **Primary Occlusion:** The user's left forearm and hand cross the waist/midsection. The new garment pixels must be strictly masked *behind* the arm and hand. - **Hair:** The long hair cascading down the user's back and right shoulder must be segmented and layered *over* the new t-shirt fabric to maintain depth. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The scene utilizes diffuse outdoor daylight (overcast sky) with soft ambient occlusion. There is no single harsh light source. Shadows on the garment should be soft gradients, specifically darkening in the underarm areas and where the fabric folds near the waist. - **Color Calibration:** The source image is studio-lit (neutral/warm). The target environment is cool/green-toned due to vegetation. The maroon of the t-shirt must be slightly desaturated and cool-shifted to integrate seamlessly with the outdoor lighting conditions. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** Absolute freeze on facial geometry, skin tone, jawline definition, and the ear visible through the hair. - **Body Integrity:** The user's arm volume and torso width must remain unaltered. The simulation must fit the cloth *to* the body, not warp the body to fit the cloth. No digital slimming or reshaping of the waistline is permitted.