When sourcing cotton crochet fabric, you must prioritize yarn count and ply, as these determine the fabric's weight and durability. For B2B applications, ensure the material is 100% combed cotton to minimize pilling. Key metrics include GSM (Grams per Square Meter), which typically ranges from 150 to 400 depending on the pattern density, and colorfastness to washing (Grade 4 or higher). Additionally, verify the stitch consistency to ensure there are no dropped loops or irregular tension that could compromise the structural integrity of the finished garment.