When sourcing cotton fabric, 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 the intended use, such as 100-130 GSM for summer dresses or higher weights for trousers. Additionally, check for combed cotton versus carded cotton, as combed fibers remove impurities and short threads, resulting in a superior hand-feel and reduced pilling.