I've now done two lessons in an adult beginners class that was for those who had never done any. The class was about 30 women and me. I stuck with conservative clothing, tights and some shorts. The second lesson I went with a biketard and singlet. I really enjoyed it although, due to the size of the class, it was a little too hard to perform all the moves. Being the only male, I could be mistaken but she seemed to want to get me to succeed and not be dispirited, and quit.
I've got strong calve muscles from continual use of treadmills, so I found it great to flex my legs