Dress codes tend to keep a lot of the people you don't want in the club out. I remember at one event I saw a guy dancing around in nothing but a pair of white briefs. When I was outside for some "fresh" air talking to my friends who were smoking, I found out from the bouncer that the guy wanted in but was wearing something inappropriate (for this club, that could mean something like blue jeans and an Ed Hardy or other similar Douchebag t-shirt) Bouncer told the guy he could come in if he stripped, but only to his underwear cause it wasn't a fetish event; but he didn't think the guy would actually do it.