From the boundless fountain of creativity that is the internet comes the above image, which reinterprets superhero costumes as they would look if they were various country flags.
There are a few obvious ones, but plenty that will give you pause. I got about two thirds of them, but the rest have stumped me.
This is actually available as a print if you want it, though I can’t manage to find an answer key anywhere. I’ll leave that to you guys I suppose.