Professional Apparel Tech Pack & 3d Mockup for Luxury Men's Shirt

We are seeking a skilled freelancer to create a professional apparel tech pack flat sketch and a 3D studio mockup for a men's modern luxury formal short-sleeve shirt. The shirt should be rendered in a solid matte black (Hex #1A1A1A) with an ultra-realistic textile product shot, flat lay perspective, crisp details, and zero distortion, embodying a formal luxury athletic aesthetic.

Key Design Specifications & Features:
Collar & Neckline: Asymmetric raised mandarin-style stand collar with a subtle V-neck opening. It must feature a hidden metallic press-stud button on the inner upper collar flap.
Closure: A diagonal exposed gunmetal zipper starting from the left side of the collar band, crossing diagonally toward the upper chest.
Chest Pocket: A single structured patch pocket on the left chest with fine satin-finish piping along the top edge.
Sleeves & Silhouette: Clean, smooth short sleeves without any arm stripes or cuts. The silhouette should be fitted and tailored with vertical side contour seams to ensure a clean waist fit.
Hem & Branding: A clean, stitch-free bonded bottom hem. A small rectangular gunmetal brand plate (1.5x2 cm) should be subtly attached at the bottom left hem.
Fabric: The design should reflect a premium heavyweight Pima cotton / technical jersey blend with a refined matte texture.