From the National Trust's online Treasure Hunt article "Black Identities" by Emile de Bruijn.
Her article in thepeerage.com is here.
Elizabeth Murray wears a middle 1600s dress with a split bodice, vee waist, and some very full sleeves for her 1651 Lely portrait. Her coiffure is borderline hurluberlu, including the panel of flat hair over the center of her head.
Keywords: 1651, Lely, Elizabeth Murray, Murray family, Tollemache family, Countess, Duchess, British, long straight coiffure, scoop neckline, chemise, modesty piece, long sleeves, split bodice, long puffed notched sleeves, girdle, vee waistline, full skirt, clasps, wrap