See, my problem with the "women have sexier costumes" argument is:
From an Art and anatomy perspective, most comic characters, male and female, ARE NUDE, with just color changes to different portions. Ya know, I mean, how is Spider-woman's costume any sexier than say.... Cyclops's? There both in skin tight body suits that are, for all intents and purposes, body paint. Even when female characters have cleavage or something, it's no different from the fully covered characters in terms of how they're drawn.
Modern artists ARE including more fabric and texture to make the characters look less nude, but historically, the medium has always included more or less fully nude men and women, with some color coverin' up the naughty bits. Ms. Marvel's costume, sexy and ridiculous? sure... but no worse than any dude still runnin' around in spandex puttin his bulge in everyone's face.
And then when it comes to films, yeah, let's not even get started, shirtless dudes are a requirement in CBM's, whereas some real cleavage on Black Widow is just outta the question