That said, like some other cliches, the sashes kept being used because they really do work. When Chris Claremont and Dave Cockrum took over X-Men, one of their goals was to revamp Marvel Girl, Jean Grey, and make her a bigger character. One of the ways they were going to do this was to give her a new costume and a new codename to replace the outdated "Marvel Girl" one. Cockrum went through a wide variety of looks for Jean before coming up with this excellent costume that also worked well when John Byrne changed the color scheme to make her Dark Phoenix. Cockrum's design for Ms. Marvel deserves a note here. It didn't make the list as it was a bit too skimpy of a costume, but otherwise, it was a great look (and of course, it also had a sash).
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.

By the end of the 1940s, superheroes had lost a lot of their appeal to the public. National Comics (now DC Comics) went from having dozens of superhero titles to only having a handful. Most of the members of the Justice Society of America fell out of sight in the world of National. Flash and Green Lantern went from appearing in multiple titles to not appearing in any books at all!

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