Originally Posted by josh8
No one's doubting that they're costumes because they're superheroes. But many of us feel that it is in good taste to at least create the idea that they're for a purpose.
I think of the costumes just as a 'uniform.' People have clothes for occasions in real life - things they put on to go to work, go to a party, to lounge around in at home. Schools often insist on a uniform to give the pupils more discipline and purpose.
I think it's the same for the X-Men. They have a uniform that offers moderate protection and makes them feel they are in X-Men mode (on a serious mission) not normal person mode.
The leather suits of the original trilogy may offer more protection than other fabrics but it's difficult to run after (or away from) anyone in those. You see on those police shows on TV where the motorcycle officers who wear leather have said they cannot chase criminals on foot very easily. In X1, the actors had trouble getting over that little wall below the Statue of Liberty because their leather suits were so restrictive and they couldn't lift their legs high enough!