PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a standard mid-weight cotton jersey. It possesses a matte finish with low specularity (no shine). Unlike the user's current heavy knit sweater, the target t-shirt has lower bending resistance; it will wrinkle more sharply at stress points rather than creating soft, bulky rolls. - **Key Features:** The "V-Twin Engine" graphic illustration and the "MOCKUP" typography are the primary focal points. These are vector-style prints that must retain sharpness but deform realistically with the fabric folds. The crew neckline and the double-stitched hem on the sleeves and bottom edge must be preserved. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** The user is in a "Crossed Arms" pose. This is a high-complexity simulation. The t-shirt fabric must exhibit tension across the trapezius and upper back. Crucially, the fabric layout must simulate compression under the biceps and bunching at the armpits. The large central graphic will be partially obscured and heavily distorted by the folding of the arms; the graphic cannot "float" on top of the arms. - **Occlusion Handling:** The user's crossed arms (forearms and hands) and the wristwatch on the left wrist are rigid occluders. The new garment must pass *behind* the crossed arms but remain *in front* of the chest. The user's sunglasses and hair do not interact with the garment, but the chin may cast a proximate shadow on the collar. *Note: Since the user is wearing a long-sleeve sweater and the target is short-sleeved, generative in-painting is required to render realistic skin texture on the forearms where the sweater sleeves currently exist.* PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user environment features strong, directional natural sunlight filtering through trees (dappled lighting). The lighting is high-contrast with hard shadows. The flat, soft studio lighting of the source t-shirt must be discarded. A dappled shadow map (gobo effect) simulating leaf shadows must be projected onto the white fabric to match the environment. - **Color Calibration:** The source white is a sterile, cool white (D65). It must be color-graded to accept the ambient warm hues (yellows/greens) from the surrounding foliage and sunlight. The white point must shift warmer to avoid the shirt looking like a superimposed sticker. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head region, including the styled hair, sunglasses, facial hair, and jawline, must remain pixel-perfectly frozen. - **Body Integrity:** The user's broad shoulder width and stance must be maintained. Do not warp the torso to fit the mannequin shape of the source image. The simulation must respect the volume of the user's chest while acknowledging that the t-shirt removes the artificial bulk added by the original thick wool sweater.