Well, I've never done a costume for my self before. When I was a very little kid, my mom made one though. It's the only costume I ever wore when I actually went out... before I figured out that it was a higher ROI to just ask my mom to buy all the good candy for our selfs instead of costumes.
That costume was comprised of four, gigantic orange circles... Thinking about it I had to actually look like a pumpkin themed hamburger, with my body as the meat while I was walking around. The insides of the two layers (bun parts) was stuffed with something foamy, and each year it slowly migrated lower and lower...