*waves* a little late to the party, but I wanted to chime in quickly. I was Dream Queen for the Alpha Flight shoot last year at DragonCon, and thank you for liking our costumes!

To answer questions:

Northstar and Aurora had reflective material on their costumes that made them get all glowy under camera flashes (Actually,if you were too close to them, it would totally wash out your pix!)

And the Sasquatch was definitely not stuffed! While he didn't move as much as he wanted to in it, our fearless leader Allen was inside on stilts! It took him about 8 months to create the costume, and if you read Wizard Magazine, you'll see it won the Grand Prize in their 2010 Halloween contest. He could only stay inside for about 20-30 minutes at a time, due to heat and weight, but it was still impressive in person!