Size: USA S size I'm not sure of the exact cm size for Japanese sizes, but since the inside is quite fluffy, I think it would be good for children around 11cm if they wear tights. I received this as a gift. The color is light yellow. Unisex color. There is a stain on one side. I had it in my bag while I was out. I think it's a tea stain. I had it professionally cleaned, but... It didn't come out. Please refrain from purchasing if you are concerned. ※ Also, I wore it a few times. I think it was because I opened the Velcro wide... There was some fraying, so I sewed it. Cold protection