They supply you with towels, otherwise most women wear lingerie, body stockings etc. Men tend to wear shorts. Footwear is anything from barefoot, flip flops/sliders to killer heels. There are lots of steep stairs to explore the whole building, so bear that in mind as well!
Definitely wear something on your feet. Lots of things get spilled on the floor. From drinks, to other stuff too... and as the previous poster mentioned, there are a lot of stairs too
