Not only are they unnecessarily sexualised, they are also extremely impractical in most cases. For instance, why would a female character with no superhuman durability to speak of go into battle with heavily armoured and massively powered opponents wearing what is essentially a bikini? It shouldn't happen, but it does happen in comic books - and it happens a lot. Of course, there are characters whose durability is such that they don't necessarily need to wear full body armour in battle but, even so, revealing 90% of their body is still unnecessary.
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Superman soon had lots of company and lots of competition! What do they have in common? All superheroes have some type of extraordinary power or ability. Their "superpower" can be something they're born with: Superman, Wonder Woman, Thor. It can be the result of an accident or mutation: Spider-Man, The Incredible Hulk, Wolverine. Or, it can be simply a skill they have learned, honed and perfected beyond the average: Batman, Hawkeye. They all have a strong moral code and a motivation to rid the world of some menace.
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Soon, other artists streamlined Shuster's original design and made it look more like spandex. Thus, the classic Superman look was born. This was not just the ideal Superman look, but it became the ideal look for superhero costumes period. The success of this design informed essentially every superhero costume ever to follow after it. For a character as popular as Superman, who has been adapted into so many different forms of media, it is an amazing testament to how good his first costume was that when Action Comics hit #1000, Superman was wearing essentially the same costume that he wore 999 issues earlier.
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However, when Wolverine was then chosen as one of the main characters in the All-New, All-Different X-Men to debut in Giant Size X-Men #1, Marvel turned to Gil Kane, who had become a go-to cover artist for Marvel in the mid-1970s, to draw their cover debut. Kane looked at Wolverine's costume and decided to add a cowl to his face mask rather than the whisker look that Romita had on the original costume. Dave Cockrum had drawn the original costume throughout the issue, but after he saw the Kane re-design, he liked it so much that he went back and re-drew it all the way throughout the issue. Almost five decades later, that Romita/Kane design still stands out as Wolverine's most commonly used costume.
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Not coincidentally, it also featured the best bat-suit yet on film. It may not have looked quite as definitive in close ups as Michael Keaton's outfit, but it moved more fluidly, owing largely to the suit's increased mobility, and especially coupled with its flowing, shadowy cape, cut the best silhouette of any of Batman's onscreen looks -- sorry, Batfleck.
Emma Frost is a mutant in Marvel comic books who first appeared on panel in 1980. Originally presented as a villain, she has evolved into a superheroine over the years. Her powers include telepathy and the ability to turn her body into a diamond form, which obviously makes her incredibly durable and also grants her superhuman strength (though she can't use her telepathy whilst in that form).
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!
Dejah Thoris originally appeared all the way back in 1917 as the princess of the Martian city-state/empire of Helium in Edgar Rice Burroughs's series of Martian novels (the same source that introduced the more well-known John Carter (that guy who got a movie to himself in 2012) - the man who happens to be her husband). Since then, she has appeared in a number of comic books, most notably in Dynamite Entertainment's 2010-11 comic miniseries Warlord of Mars.