Specific standards for underwear quality guarantee:
1. Fabric quality: The fabric should be free of damages, defects, and color differences, and possess good properties such as air permeability, hygroscopicity, and elasticity, and indicators such as color fastness should conform to relevant standards.
2. Sewing quality: The stitching should be neat and firm, without skipped stitches or broken threads, and the joints should be flat without wrinkles or twists.
3. Dimensional specification: The size should conform to the design requirements, and the error should be within a reasonable range.
4. Shape stability: It should maintain the basic shape after washing without severe deformation.
5. Accessory quality: Items such as shoulder straps, buckles, and decorative pieces should be sturdy and durable, and not easily damaged or fallen off.
6. Wearing comfort: There should be no obvious foreign body sensation or stinging sensation, and it should not affect normal activities and wearing experience.
7. Durability: Under normal use and washing conditions, it can maintain good performance for a certain period of time.
8. Environmental protection and safety: The materials should meet environmental protection requirements and not contain harmful substances, and be safe for the human body.