Gum on the bottom of a shoe Halloween costume; clever. This is probably ranks up there as one of the cheapest homemade costumes you can come up with.
That is if you have a sweatshirt the color of a gum brand.
Unfortunately, I do not. Not red for Big Red or green for Wrigley's Spearmint. I do however have a brown sweatshirt. Which means, instead of gum I can go as the ultimate thing you don't want stuck on the bottom of your shoe....POOP!