I purchased this on Rakuten. I bought it to prevent my child's menstrual leaks, but when I tried it on, it was too small and wouldn't fit. It seems like it could also be used as loungewear. Originally, it's a nursing care product, but it seems like it can also be used to prevent bedwetting in children. The size is 160, which is a size M. I bought it for about 3600 yen.