I'm gonna go out on a limb here and suggest/guess that Anita is wearing identical stockings on both legs, but that her left leg has a blue ribbon wrapped around it because she is Anita BLUE and likes to have something BLUE on in her scenes.
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--Some of us look for The Way in opium and some in God, some of us in whiskey and some in love. It is all the same Way and it leads nowhither.