Thomas cleverly adapted the concept of the original Fawcett Captain Marvel by making it so that Rick Jones and Captain Marvel change places whenever Rick clangs two Nega Bands together. Kane, meanwhile, re-designed Marvel's costume, giving him a primary color extravaganza. It was bright, it was bold, it was a complete 180 from the drab outfit that Mar-Vell wore before. In recent years, when Carol Danvers took over as the new Captain Marvel, Jamie McKelvie's take on her new outfit adapted the color scheme and a lot of the elements of the original Kane design.
Cockrum then revamped a few of the characters with Len Wein to make them the new X-Men in the All-New, All-Different X-Men. However, one of the characters was so perfectly designed that they just adopted him wholesale. That was Nightcrawler, whose circus-esque costume perfectly fit the carefree personality that Cockrum and Wein came up with the for character in the X-Men. It is the perfect swashbuckling outfit. The X-Men seem to go through more costume re-designs than any other team of heroes and yet Nightcrawler's costume has mostly remained unchanged for over 40 years.
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.
If you talk to many comic book fans that entered puberty in the ‘90s, they might list Gambit as the cause of their sexual awakening. Maybe it was the Cajun accent? Or perhaps it’s the dark, red eyes? Either way, Gambit will go down as one of the all-time sexiest characters in the Marvel Universe. The character is one of the few on this list with a costume that covers almost his entire body, down to just leaving his face and hair exposed. This modesty doesn’t stop Gambit from being a character that’s known for his sex appeal.