Take either a red or white skirt and create stripes with whatever color isn't there with extra fabric or tape or something. You can glue real popcorn to a white crop top, or you can make popcorn out of yellow tissue paper (I vote for the real!). Add a cute popcorn hat you can make out of an old-fashioned popcorn box, and you're good to go! Bonus points if you carry around real popcorn to eat.