The costume went through changes because of the now famous "Keaton Turn", where Michael Keaton's cowl was so stiff he couldn't turn his head, and had to turn his torso to look left or right. When Christian Bale took the role, he was specific about what he wanted in a suit: to be able to turn his head, move unrestricted, and be able to pee without having to spend two hours taking the suit back off.

If I had a nickle for ever time a woman told me to get lost, I could buy Manhattan.