When sourcing luxury jackets, prioritize high-grade natural fibers such as Grade A cashmere, 19-micron merino wool, or premium goose down with a fill power of 800+. For leather goods, ensure the use of full-grain leather with a thickness of 1.2mm-1.5mm. Craftsmanship should be verified through stitch density (minimum 12-14 stitches per inch), the use of YKK Excella or Riri zippers, and reinforced seams at high-stress points. Request high-resolution macro photos of the lining and internal finishing to ensure no raw edges are visible.