The hero doing the punching was courtesy of a clever design by Joe Simon, who took the concept of the red, white and blue split of the American flag and worked all three colors into the design of Captain America, giving him chain mail in the process to give him a bit of a classic knight design. Few superhero costumes have remained quite as unchanged as Captain America has for nearly eight decades now, with the only changes mostly been adding things like military belts and the like.
Arguably, Iron Man has the coolest costume out of all the comic universes, because it's both beautiful and functional. It's not just the little kids who want to grow up to be Iron Man, even grown men would love to fly around and shoot at stuff. If the Iron Man suit was real, people would sell anything they could to purchase it, because it turns an ordinary guy into a powerful superhero with the strength and firepower to defeat a whole army of superhumans.
Over the years, though, in an attempt to lighten the character up, the black of Batman's costume became bluer and bluer and during the 1960s, DC even added a yellow oval behind Batman's bat symbol on his chest. In the 21st Century, however, artists have re-embraced that classic design and gone in the direction that Jim Lee took the costume during "Hush," which is to make it dark and have the chest symbol return to just a black one without the yellow oval, which brought a little too much lightness to the design. Frank Miller famously was initially stuck with the yellow oval look in Dark Knight Returns, but then had Batman shot in the chest. When he fixed the costume, the yellow oval was gone for the rest of the series!
The costumes and designs for our favorite heroes have changed throughout the years, and while many modern versions of heroes are the best looking of the character, there are some that they just got right from the beginning. There are some that are improved though, and other heroes have so many different costumes, it’s difficult to pick which is the best.