it's amazing how in the comments nobody noticed that the episode wasn't related to a "disguise " purpose, there is nothing like an "imposter " here. In other words there isn't anything but a fight in the parking lot
the title says all, it's a moment of parking rage or better to say revenge, and the black clad woman takes the clothes of the other woman to vent her satisfaction and her triumph over her defeated opponent , what at our board is definitely an unexplored motivation