This is a great idea. I'm planning to carry on, but I was worried the airline would decide not to hang it up for me when I get there.
After reading this I decided to call the airline my FI and will be traveling through and I was told I can carry on my dress as long as it will fit in the overhead. She said they do not have a closet to hang it in. So I will be getting one of those air bags that I'm able to suck the air out and pack my dress in an carry on suitcase. I will get it steamed at the resort once we arrive. Oh, we're flying US Airways.