Viola Davis in L'Wren Scott

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Lights! Camera!
Defying the notion that sexy has to be short, a strapless purple sheath with below-the-knee flare (L'Wren Scott) is the sort of thing Marilyn might have worn for lunch in the studio commissary, maybe with tortoiseshell sunglasses (Proenza Schouler), black croc heels (Jimmy Choo), and a casual animal-print cardigan (Rebecca Taylor, $295). 

Bracelet, House of Lavande. Bag, Roberta di Camerino.