Yeah - I used to do this every year for my boys costumes...
Go to Hobby Lobby and get one of those plain canvas bags (or I suppose you could even get a red one...)
Get the fabric paint in Incredibles matching colors, and first pencil on that *I* symbol they have on their INcredibles Costume - then paint it in, with the paints.
I can't draw at all, but it's a great idea. Maybe I can do an iron on if I can find a good quality clip art of the symbol or even of all of the incredibles. Thanks for the idea!