I'm sure some guy at a local shop told me when I bought mine you are suppsoed to buy a size bigger than what you actually are as the do shink a tiny bit.
One thing I have noticed with my Evisu's is that they seem tight around the crotch but ok everywhere else. I'm not hung like Omar so that isn't the problem I think it's becasue alledgedly the japs aren't hung to well or maybe they are a different shape to us if that makes sense and doesn't sound racist