I've never been to one in vegas, but it has been on my to-do list for a while....even my wife is pumped up to get all dressed up and go see a big time fight....maybe we should save our $ for something else....
I saw klitchsko fight at staples a while back but it was kind of weak....
i wouldnt get the wife all dressed up unless you are ringside first few rows. otherwise casual dress is fine.