When sourcing organza, the denier (D) and thread count are the most critical indicators of quality. Standard high-quality organza typically uses 20D or 30D polyester filaments. You should verify the stiffness and crispness, which are achieved through specific heat-setting processes; the fabric should maintain its structure without being overly scratchy. Additionally, check for uniformity in the weave to ensure there are no visible slubs or gaps, and confirm the weight (GSM) matches your specific application, usually ranging from 20 to 35 GSM.