Opinions on my last minute halloween costume?

For like a month I thought I wasn't allowed to go trick-or-treating because I am too old but now I can if I find someone to go with. Now I'm not creative and I don't have a costume so I was thinking of wearing my cheerleading uniform. It's a long sleeve crop top that's red, blue, black and silver. The skirt is the same color and it's really short. I was thinking of wearing like warm-up pants or zepra pj pants underneath since it'll be kinda cold. What do you think of my idea? Any ideas for other simple girly, last-minute costumes?