When purchasing clearance stock, it is vital to distinguish between overstock (A-grade), shelf pulls, and customer returns. You should request a detailed packing list (manifest) that specifies the ratio of sizes, colors, and styles. Ensure the fabric meets composition standards (e.g., 100% cotton or specific GSM weights) and check for defects such as broken zippers, missing buttons, or fabric stains. For high-volume B2B buyers, hiring a third-party inspection service to conduct a random AQL (Acceptable Quality Level) test is the most reliable way to ensure the 'clearance' label doesn't hide unsellable damage.