The thing about Spider-Man is that his suit works for him, even in a real-world scenario. He was designed at a later period in time, and thus it does not have archaic design elements like the underwear outside the pants.
Thats not the reason. The reason is that hes from Marvel, and the underwear thing was Superman's. Kane created the Batman suit by tracing Superman's, but they were both from DC, it was no biggie. Copying or a major designing resemblence from a different company would make waves
On top of that, his tights are frequently lampshaded in the story with people constantly calling him a circus freak. His costume is meant to look extremely formfitting and flexible, because it's really just there for show and nothing else, since it's not supposed to provide any sort of protection or other functions. And given that his suit was originally designed to be a wrestling costume, it's well within Spider-Man's character to wear a costume like that
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And same goes for Batman's costume. Spiderman can be killed like any other human being with shots and string blows, same goes fro Batman. The comic book Batman had a durability and flexibility almost matching SpiderMan's, and he relied on his quikc reflexes and almost inhuman aerobics
What reason does Batman have to wear a costume inspired by circus tights, other than to please the fanboys?
As explained above and before, flexibility and lack of ANY restriction of movement whatsoever. Spandex provides that. And again, I dont see and never thought of Batman as wearing circus thighs. I guess its a matter of perception, but if he really does, then that only speaks for the functionality of that costume - just like the circus performers, his moves are completely uncompromised. Batman in comics moves very much like Spiderman, and just like him, he can be hurt but doesnt wear any protection because he relies on his physical movement and durability so it cant be compromised in any way
I can't think of any. He'd want something that is tough, flexible, and says to his enemies that he's there to crack some skulls. Would I like something more sleek looking than what was in The Dark Knight? Sure.
Of course not. As I said already, its actually the movie suit that doesnt make sense when it comes to functionality. It weights a lot and slows down movement, not to mention that it greatly reduces the ability to move. And also, with a thick head mask, it dimms down the perception and hearing as well. The fact that the mask sticks out from the face also restraints eyesight. But so what? Kubrick said "real is good, interesting is better" and I very much agree, It looks great, and thats why its there. Not because, like you say, Batman's outfit is ridiculous or not functional. Again, the story of how the black body suit came to be goes back to Bob Ringwood (costume designer) dislike for Batman resulting in his complete redesign and change into something very different - from spandex to think body suit, and that idea carried over and stayed in the movie because it just looks good. But the iconic Batman costume looks just as good, and I will never agree on that bashing towards it
Do I think that the ideal suit for Batman in live action is one that looks just like the comics? No, and if you disagree with me that's fine,
I dont disagree at all. As I said, I culdnt give two hoots about whats in the comics or not despite being a reader since 88. I care what looks good, not what looks like comics. And since the spandex suit was already done in the serials and TV show, and since a comic book look alike black armor suit was also already done in the previous movies, its interesting to see an almost total redesign that we got in TDK which I very much enjoy
but I don't think that the audience is going to buy it if they see Batman wearing black undies over his pants, regardless of what material you make it out of or how much money they throw at it.
Here I disagree because no one except for you thinks spandex is silly and Superman still looks good , and secondary, the "Dead End" movie was very praised by the fans and the comic book fans and it was dark and acclaimed everywhere, yet it had a spandex comic book suit
The only real reason I accept that he dresses that way in the comics is because all the other superheros in that world dress that way, but in a movie it just wouldn't make sense.
And as I said, it makes perfect sense for him and for his movements to have a spandex suitlike people who perform physical acrobatics, as oppose to think, slowing down and defeaning heavy suit.
And of course AGAIN, Im not pitching for the comic book suit in TDKR, Im pitching for the TDK suit to stay in, Im simply defending Batman from bashing, but seeing how popular the character always was and how the design is still so praised and acclaimed after so many decades, I dont think it really needs any defending