Boring and uninteresting they may be, but they fit within the context of the universe created in these movies, and that's far more important than appeasing the insanity of costume-zealots.
I think the wolverine mask + costume scene is incredibly out of place, only appealing to the previously mentioned costume crazies, and I'm glad the took it out. Even if they do classic costumes for the inevitable reboot, I still think Wolverines mask is dumb, and hope they show restraint like Singer has.
Even Marvel has shown restraint when adapting to live-action. Their tone is certainly more light-hearted, but even they can tell when a direct adaptation does and doesn't work.
When can stuff translate easily? Winter Soldier, Iron Man (in no small part thanks to the Extremis book), modern Hawkeye, Thor's armor (though more thought and detail had to be put in to make it work), SHIELD Cap.
But that said, Thor's helmet is admittedly unwieldy, and so they just don't use it. You aren't going to be seeing classic Falcon or classic Hawkeye any time soon. Black Widow's outfit is less "low-cut catsuit" and instead is simply just a more militaristic-looking bodysuit. Want to see comic-accurate? Look at a cosplayer, but they'd look real stupid in a movie that tries to maintain
some level of believability. Same reason you will probably never see the Ms. Marvel costume. They didn't put the wings on the Cap helmet because why would they? Why would anyone? Hell, the only time he wears his "true-to-the-comics" costume is played off as a joke, and even then, it is
literally a costume designed to entertain on a stage show in 1940's America. The comics acknowledged it too with relatively recent books redesigning Cap's WW2 outfit to look more "of the era" blended with iconic imagery of his costume. And hell, they got a "truer" take on his costume in The Avengers and it honestly looks the worst.
The X-Men movies largely play the team off as a kind of black ops group. Alot of the classic costumes, especially considering when the first X-Men movies were made, would not work. And even now, Wolverine's costume sure wouldn't work without serious rethinking. But if you were a respectable costume designer working in movies, you'd probably be thinking about Logan's personality and wondering if a person like him would wear a costume at all. Why would he? What's the point of it? Some other characters might, but his reaction of "You actually go outside in these things?" in the first X-Men movies frankly feels more accurate to the character's personality than anything.
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