I just wore sweat capris and a tank top. You sweat a lot... Or at least I did.. So I recommend something comfortable that you don't mind sweating in. I also STRONGLY recommend a sport bra. Trust me--you're moving enough that you will want to have one on. ;-)
Thanks guys! I'm going to a class and it really is a lot of fun. I definitely felt like I got a workout. I'll keep you updated on my progress, but hopefully it'll help me over the hump so I can get closer to my GW.