Clothes bought in JD.COM have recommended sizes, while clothes in JD.COM are mostly made by third-party brands, so the sizes of each brand are different. Each brand will have its own size chart, and there are recommended sizes according to your height and weight. You can look them up on the product page. In addition, you can learn about the size information by reading the comments, especially those about your size. If you can't buy it again, it's not appropriate to return it. Don't be afraid to return goods online.