Unless you've been living in a cage,you must know how batman looks.They couldn't change that,especially the ears,he would look downright stupid without them.
Catwoman isn't nearly as mainstream as batman,they can afford to change certain things of her aspect,if necessary.
I'm pretty sure Catwoman's as mainstream as Batman is. And when someone hears the name 'Catwoman', I'm sure they'll be disappointed if they don't see a cat-like costume.
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