HM is a chain store, and all stores can return it if there is any problem within the effective time. However, if your clothes are discounted or sold at a low price, you won't return them. There should also be a note for you on WeChat payment. There is clear information on the clothes, but it is difficult for people to return it to you without a receipt. I suggest you find a nearby store and ask if the receipt paid by WeChat can be changed.