I also went to two Costume Design panels. Mary Vogt, who is a costume designer, and was on one of the panels took a picture of me in my Iron Man costume; that was cool. Anyway, all the designers on the Movie Costume Designers panel were very insightful and really excited to talk to everyone in the room. Michael Wilkinson, whom I didn't know much about before the panel had some great visuals for Watchmen. He showed this little video which got me excited about Watchmen and costume designing.
Aaaand my costume:
I thought that I was going to be really hot in it, but my skin was moist all day, and the air conditioning was on full blast, so I was more often cold (which is better than being hot). I got a million pictures taken, was molested by Robin, entered a costume contest with a fellow Avenger, and made it to the top 8, out of about 30 (I think), and met some cool people.