THe Halloween Debate

Holden is going to be Mickey Mouse for halloween. The costume is ordered and it's on it's way. Danny can't decide what he wants to be. Every day it's something different. For a long time, it was Mickey Mouse also. Then he moved on to Bob The Builder. Recently, he's decided he wants to be superman. He's never ever seen the show but Holden has the pj's. It must just be instinct. So the question, is do I just purchase one costume and insist he wear that or do a combo like super bob or super mickey mouse??