portrait of the artist as a young batman

Today's world needs more underoos. Back in the late 70's/early 80's there was an embarrassment of riches as far as kids underwear apparel went.

Along with Batman, I also had Superman, Spider-Man, and Luke Skywalker (X-Wing flight suit version)...I have a vague memory of having Flash underoos, too, but the internet doesn't seem to confirm the existence of such a thing...which, if true, seems like a strange omission to me...I mean, they had Aquaman underoos, for God's sake...