I wear a size 9.5 (size 40 in European sizes) and have consistantly bought shoes in this size and they always fit. Not these clogs. My big toe is about to bust out of the end of the shoe. I passed them on to my daughter who wears an 8.5 and they fit perfectly. So by all means when buying this shoe go up at least one size. The shoe is narrow but for me the biggest problem was in the length. The actual clog is very, very attractive (we got the saddle color). I think with wearing the leather may stretch, but it might be painful waiting for it to stretch enough to fit one size larger!