Here on the island right now.. We went to Avicii and to Sasha. Just to be clear, Ushuaia club goes until 12, Ushuaia tower goes until 2am. Anyway, happen to meet Sasha as we decided to take the stairs down instead of the elevator. Very cool, very nice guy.
Anyway, in regards to the dress code, I saw people up there in tshirts and shorts. But no tank tops or flip flops. Personally, I didn't find any snootiness or exclusivity, but hey, I guess if others get turned back then they are bound to take their anger out on someone.
It's actually a great party up there, view is awesome, and I'm glad they don't cram you in there like sardines. So obviously they'll have to turn people back. Half our group was in shorts, and we were all guys, had zero attitude or problems.
An epic fail is clubs filling to double capacity and tolerating idiot steroid junkies that get overly drunk and spend the night pushing others around.
So people shouldn't worry about the dress code so much..wasn't an issue from what I saw, regardless of what some experienced. And it goes until 2 or 3 am..