When sourcing cotton woven fabrics, the yarn count (e.g., 40s, 60s, 80s) and thread count are primary indicators of quality; higher numbers generally signify a finer, smoother, and more durable fabric. You must also verify the GSM (Grams per Square Meter) to ensure the weight matches your specific application, whether it is lightweight voile for shirts or heavyweight canvas for bags. Additionally, check for tensile strength and pilling resistance to ensure the fabric maintains its integrity after repeated use and washing.