Originally Posted by The Guard
Is this a serious question?
Absolutely. The costume pieces brought up serve no purpose other than to properly translate the superhero's iconic look to film. Batman isn't trying to poke eyes out with the ears, Superman doesn't go any faster with the cape and Thor's chainmail is a wardrobe choice, doesn't really add anything during combat.
Those things just look cool because they've been looking cool on the page for decades.
Everyone wanted Cap in his Agent Rogers suit from the start to avoid the walking American flag, but the Marvel Studios guys knew better than to rob him of his true look.