It's not a costume, it's just your clothing (no matter how many people tell you you look like an old person. It's called *dignity.* And *modesty*.) All your costumes are packed neatly in your trunk, with the rest of your clothing. And they're not costumes either. They're also just clothing. The people who originally wore it didn't treat it as a costume, and so you don't either.
Ugh, you're making up a guy to get mad at. Normally it's a very satisfying pastime, but you have more important things to do.