Ko Olina The US6 is a size 9, M, but it seems a little large. I bought it when I played a round at Ko Olina. I wore it once after returning to Japan. It has a little stretch. There is one spot on the hip area that has a small knot, but this was from when I purchased it, and I think it's due to the weaving of the thread. I've added a photo so you can see it from the back, and it looks like it was originally part of the fabric. The check pattern makes it almost unnoticeable. Please be aware of this before purchasing.