When sourcing cotton sateen, the thread count (TC) is the primary indicator of quality; for premium B2B applications, look for a range between 300TC to 600TC. Ensure the fabric is made from 100% Long-Staple Cotton to prevent pilling and enhance the characteristic silky sheen. Technically, the sateen weave structure (four-over-one) should be tight and uniform. You must also verify the yarn count, typically 40s, 60s, or 80s, where a higher number indicates a finer, softer yarn. Always request a GSM (Grams per Square Meter) report to ensure the fabric weight meets your specific end-use requirements, whether for bedding or apparel.