This is one of the items I bought in Guam for going to the gym. It's US size S, so it's like a slightly larger S to M in Japan. The fabric is light and a little sheer, so a sports bra with some color would be cute for yoga, etc. Originally, it was a $30 item. It's been stored at home with the tags still attached. Please understand that it's been stored in a pet-free, non-smoking home before purchasing.