If I were a hero, I'd be Martin Luther (Part 1856)...

 Superhero Anydays

I mean have posted this already, but I don't care, it makes me smile.  This by the iconic and iconoclastic artist Fred Hembeck, and its the early members of the Legion Of Super-Heroes, before they made costume changes in the mid 70s. 

Invisible Kid, Bouncing Boy, Matter Eater Lad

Lightning Lad, Cosmic Boy, Saturn Girl, Superboy

Star Boy, Sun Boy, Colossal Boy, Element Lad, Mon-El

Phantom Girl, Brainiac 5, Ultra Boy, Chameleon Boy, Triplicate Girl

Shrinking Violet between Ultra Boy's feet

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And we also have a shirtless guy, in jean, chest painted as Johnny Thunder, the Human Torch of the Fantastic Four.

POLT