He looks like he might understand your plight, ask the geek

You walk up under him and hold up the flyer before asking, “Hey dude, ya gotta help me out I need a chic costume for this party and concert. Heck you could even come if you want. Is there anything here that will fit me?”

He looks down and steps off the ladder. “There probably is but they are all crap.” He sniffles and looks around. I can’t go any more my stupid boss is making me work tomorrow, I should quit.”

“That sucks,” You agree with him letting him know you care, as if, “So what do I do?”

“Well I do have the perfect costume I made for my friend, he can’t go either his mom won’t let him, if you can go talk her to let me have the night off.” He points at the girl at the front counter. You look around not knowing how you could possibly do that before deciding.