A photorealistic commercial video sequence of women's black wide-leg casual trousers with a front vertical seam, 15 seconds long, 9:16 vertical ratio. Shot 1 0-3s A cinematic slow zoom-in on the smooth black fabric texture, a female hand gently strokes the material, background shows a white wall with sharp sunlight shadows. Shot 2 3-6s Cut to a headless female model wearing the black trousers and a white crop top, showing the elastic high waistband and drawstring details. Shot 3 6-9s Medium full-body shot of the model standing in a modern bedroom with a wooden bedframe, showing the leg-lengthening vertical seam detail on the front of the pants. Shot 4 9-12s Close-up on the thigh area, the model's hand pulls the fabric firmly outwards to demonstrate high elasticity and stretchiness. Shot 5 12-15s Macro extreme close-up of the black waist drawstring knot. Lighting is bright, high-contrast, natural sunlight entering a bedroom.