When sourcing silk, the primary indicator of quality is the Momme (mm) weight, which measures the density of the silk; for high-end garments, a range of 16mm to 22mm is standard. Buyers must verify that the material is 100% Mulberry Silk, characterized by its long, uniform fibers and natural pearly luster. A professional 'burn test' should result in a smell of burning hair and ash that crumbles, rather than melting like synthetic polyester. Additionally, ensure the fabric is Grade 6A, which represents the highest quality tier in terms of tensile strength and purity.