black and white outfits

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I think it's part of who she is -- her New York bitch look and attitude. Plus, color is for saps. She's out to get want she wants and book it out of town. An nice black functional skirt and a button-up blouse are all a woman needs. Plus, keeps the lame-o men away.

She wore a grey suit when they were in her husband's apartment in killed him.

She's a no-nonsense woman trying not to be noticeable while she's on the run.

Another reason is that this is an example of film noir, a type of film that was traditionally in black and white. In this case the film is in color, but the main character continues the trend of black and white.