There is no dress code to my knowledge. When we were down in March & again in May we went inside - not too many people - just so you're not disappointed - you do understand it is kind of a 70's/80's disco?
I didn't say it was a bad thing--- DW & I are both in our 40s - and we thought it was a hoot. You should also check out the karoke bar in the Dolphin (talk about fun). I hear Jelly Rolls is a good place - haven't tried it - Yet!