Well seeing as how they didn't get it right with Armani in Batman Begins they clearly decided to start over. Bale should insist that only his stylist from American Psycho can dress him. Those suits were spot on.
He could give a shit less probably. Do you even think he is in touch with him/her. He just wears what he's told, unless he happens to troll this site.
I think that they do it on purpose. I remember reading an interview with lindey hemming (James Bond Wardrobe head from Goldeneye-Casino Royale) saying that they dressed him in a way that they bruce wayne would dress if he wanted to help conceal his identity which is why they went with Armani. I don't feel its a fail on the wardrobe peoples parts as they really did go into a lot of detail with TDK and batman begins at least, Even the watch chosen was a JLC reverso with a white face on one side and a black on the other to "echo the duality of the film" and If I'm not mistaken i believe edward sexton did the jokers suit but this might have been for the earlier batman movie. But back to my main point this is suppose to be a man (bruce wayne) who in reality doesn't really care about clothing and just buys and wears the stuff because its from armani and flashy and that helps him cover up his late nights as Batman.
A conscious choice I guess. I think they are inspired by Jeph Loeb and Tim Sales interpretation of Batman (read them if you haven´t, they are great). I always get a feeling of the eighties when I see Batman.