I guess I'll ask the question we're all thinking. Why is that guy there? Are they all carpooling together because there's a 1920s strong man competition in the same building as the prom? That's what this guy looks like. You don't see strong men looking like that anymore. I think that's a shame. It's a good look. He's putting those nice-suited boys to shame with his tight shorts and striped shirt. Though the real showstopper is the mustache. It could be real. It could be fake. I don't care. I'm down for someone to rock a fake version of that mustache. That's even cooler, in a weird way.
The reality is that this is one of their brothers or dads. That's just how he normally dresses. "Let me get a picture with the boys." / "Sure, just stand far enough away that we can crop you out."