When sourcing high-end fashion, focus on fabric composition and weight (GSM) to ensure the material matches the intended season and price point. Inspect stitching density (SPI - Stitches Per Inch); high-quality garments typically feature 10-12 stitches per inch for durability. Pay close attention to seam finishing, such as French seams or overlocked edges, and ensure pattern matching at the seams for printed fabrics. For functional items, verify the quality of trimmings like YKK zippers, reinforced buttons, and eco-friendly linings.