Leather jacket ... over superhero tights.
Maybe with the jacket sleeves pushed up to the elbows jauntily? Finished off with some leather driving gloves, for precisely no reason?
It's ... a look. You can't say it's not.
At least, it was a look, back in the bad old days of the benighted '90s, when superhero fashion, like skiing, skateboarding, makeovers and underarm deodorant, got extreeeeeme.