PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a lightweight, semi-sheer material (likely a linen-blend or synthetic organza). It has high light transmission, meaning the user's skin tone should be faintly visible through the neon fabric. The drape is loose and fluid, prone to soft micro-wrinkles rather than stiff geometric folds. - **Key Features:** The Camp collar (Cuban collar) structure must be preserved, sitting wider on the neck than the current crew-neck t-shirt. The neon lime green hue, the visible front button placket (white buttons), and the cuffed/hemmed short sleeves are critical details. The transparency/texture grain of the fabric must be retained. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's crossed-arm pose, the simulation must calculate high tension across the upper back and shoulders. The fabric must bunch and compress significantly in the crevices of the elbows and under the crossed forearms. The loose fit of the source shirt means there should be slight "billowing" above the crossed arms on the chest, rather than the skin-tight fit of the current blue t-shirt. - **Occlusion Handling:** The user's forearms and hands are the primary occlusion layer. The new garment must be rendered *behind* the crossed arms but *over* the chest and abdomen. The intersection line where the arms press against the torso requires precise masking to ensure the shirt looks tucked/pressed under the arms, not floating on top of them. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user is in diffuse outdoor daylight (shadows are soft, likely overcast or shaded balcony). The studio lighting of the source shirt is too flat and bright; it must be adjusted to accept the ambient occlusion from the user's crossed arms. Shadows must be cast by the collar onto the neck and by the arms onto the stomach area. - **Color Calibration:** The neon green must be color-graded to match the outdoor white balance of the user photo (Samsung camera profile). Expect some green color bleed (radiosity) from the bright shirt onto the user's neck and inner arms due to the reflective nature of neon fabric in daylight. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head, facial expression, hair, and neck structure (up to the collarbone) must be strictly frozen. The watermark ("Samsung Quad Camera") in the corner should be preserved if part of the final composite frame. - **Body Integrity:** Do not slim the user's waist or alter the muscular definition of the arms. The volumetric space the user occupies must remain constant; the loose shirt should add volume to the silhouette, not reduce the user's body mass.