I have a waist of 64cm and bought a size S. This fits very nice around my waist; it isn't too tight or loose. There are however some things I don't like. The fabric feels a bit "cheap", which doesn't usually happen which Chuu, so I am quite dissapointed about that. Besides that there is a underskirt, as can be seen on the pictures. However, you can clearly see the outline and the presence of this underskirt when wearing the skirt. I think this underskirt was placed there so your underwear wouldn't shine through, which it did, but now the underskirt can be seen clearly.