Originally Posted by olebat
When in doubt, phone the instructor, or one of the class organizers. Ask about the temperature of the room so you'll have a better idea of what to wear. Fashion is not as important as comfort. ... Laugh it up, have fun!
After so many kind suggestions of what to wear, I just wanted to say that I was joking! :D In my imagination everyone would be wearing quilted clothing and carrying their machines in hand-quilted pouches! :D