That's the official meathead uniform. A friend and I were sitting on a bench in Tribeca and we saw numerous packs of 6-10 guys, ALL wearing jeans with vertically striped shirts. However, the worst look ever is Upper East Side/Greenwich, CT types wearing trendy Diesel/Seven/Paper jeans with black dress shoes that should be worn with expensive suits.
Hahahahahahaha. Yes, I forgot that there were variations on the uniform. One for the meatheads, and one for the wannabe metrosexual (how sad is that?) There are probably more. As for an "upscale" club, I'll tell you what - if they are really upscale, they don't need to enforce a dress code. The clientele are attracted to it by atmosphere and reputation. Most of the truly, (i.e. not self proclaimed), upscale clubs I've been in fact want to have a mix of clientele, from hipsters to glam-Euro types, to yuppies and proto-yuppies (hey, someone's gotta buy the really expensive drinks, right?) Often, it's is the true eccentrics (there is a regular at one particular L.A. club who dresses as if it were the turn of the last century) who give the club flavor.