PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source is a heavyweight denim (cotton twill). It possesses high structural rigidity and low elasticity. Unlike the user's current soft cotton t-shirt, this material must not cling to the skin. It requires angular, stiff creasing rather than soft fluid folds. The surface should exhibit a matte finish with subtle specular highlights on the weave structure where the sunlight hits directly. - **Key Features:** The open-front styling with visible buttons and the chest pocket on the left panel must be preserved. The collar structure is rigid and must stand up around the neck, not lie flat like a t-shirt crew neck. Contrast stitching and the cuff thickness are critical texture details that must remain visible. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** Due to the user's right arm being extended to hold the railing, the denim fabric must simulate tension wrinkles pulling from the armpit across the shoulder. The sleeve on the right arm should maintain a tubular shape and not collapse against the bicep. On the left side (resting arm), the sleeve should hang straight with slight bunching at the wrist. Since the shirt is open, the front panels must hang vertically due to gravity, creating a natural gap that reveals the user's torso center (or the white undershirt underneath). - **Occlusion Handling:** The user's right hand is gripping a green railing. Both the hand and the railing partially obscure the lower right torso. The new garment must be masked *behind* the fingers and the green metal bar. The user's beard interacts with the neck area; the new collar must sit naturally beneath the beard line without clipping. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The target environment features hard, direct sunlight from the upper right, creating sharp shadows. The flat studio lighting of the source garment must be replaced with high-contrast shading. Deep, dark shadows should form on the left side of the torso (away from the sun) and under the collar. Bright highlights must apply to the right shoulder and right sleeve. - **Color Calibration:** The source garment's cool studio tones must be warmed to match the outdoor "golden hour" vibe of the target image. A subtle greenish color bleed/bounce light from the water and the green railing should be applied to the lower sections of the denim to ground it in the scene. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's sunglasses, nose, beard, ears, and baseball cap must remain pixel-perfectly frozen. The jawline definition must not be obscured by the new collar. - **Body Integrity:** Strictly forbidden to alter the user's shoulder width or arm circumference to match the slimmer model in the source image. The user's current stance and physical volume must be maintained; the denim jacket is an added layer, so it should slightly increase the apparent volume of the torso, not reduce it.