Is it ok to wear a tuxedo in the casinos in las vegas?; or it that not done anymore?

Should not, or you'll feel embrassed and uncomfortable, and not enjoy the fun.
Listen to the guy who works there.

If you want to stand out as a first class asshole instead of looking like all the other second class assholes, yes.

what

You can wear tuxedo or even kimono as long as you don't get nude. :)

i'm sure you could do it if you wanted to, if they don't do it anymore you'd be a big sensasion! people wear cowboy hats in there don't they? why not a tuxedo? go for it man

Do what you feel like doing dude.

Dude... you can wear a chicken outfit, once you're gambling.

only if you want to look like an employee

No, thats overdoing it. Maybe on New Years eve, but thats it. People go dressed as slobs now.

ya sure you can wear that. u will look sexy and hot.

Im sure some people do it, however it would be kinda cheesy. Everyone in the casino would ask if you just got back from a wedding or something like that. Try getting a nice looking suit. That would look much better.