My husband has been wearing Onitsuka Tiger sneakers for years, because he loves how they look and how comfortable they are. I bought a pair recently myself. I usually wear 6 for open toed shoes, 6.5 for pumps and 6-7 for sneakers. I went with 6.5 and they fit me perfectly with 1 finger space in the back.
The recommendation was to order half a size bigger, which I thought was fair. I think 6 would have been bit too tight for my taste. I really love the color. It is so bright and I already got so many compliments. I am sure it will get dirty easily, but the material seems very friendly to cleaning. This particular Serranos have suede rim, satin body and canvas stripes.
Onitsuka Tiger Serranos are really comfortable and have enough support to let me stand around all day. If you are looking for a new pair of sneakers, you should definitely check them out.