The same clothing, clothing is graded according to pieces, divided into 1, 2, 3 and so on. 1 is better than 3, which can be distinguished according to appearance specifications and color difference defect sewing. Generally speaking, it should be classified according to international standards, but some manufacturers have their own quality inspection standards, which generally cannot be lower than the national standard. In this way, the same product produced by different manufacturers may have different grades. Qualified products, first-class, second-class and third-class products will be judged by the manufacturer. Although the names of qualified products are different, it will not affect the wearing. This standard is divided into qualified and unqualified, unlike 1, 2, 3, which is why manufacturers are different.