Wear comfortable clothes. Some students like to dress up as they would if going out to a dance and that's fine too! We are often working pretty hard so layers or lighter clothing will be more comfortable. Footwear should be dress shoes - the shoes you expect to be wearing at dances. Sneakers don't work as well.
Fred and Debbie wear dance shoes, as do some of the intermediate students. They are not easy to find in NS but we know of a couple of sources if you are interested at some point.