Lady Anne is described in Henry Streatfield's Wikipedia article. Her article in thepeerage is here.
From Bonhams' Web site; spots and linear flaws removed with Photoshop by gogm.
Lady Anne is dressed in keeping with the French Ladies in Carrogis portraits rather than British casual with abundant swagged flounces on her skirt and lace lapels and engageantes.
Keywords: 1756, Devis, Anne Streatfeild, Anne Sidney, Sidney family, Streatfeild family, British, straight coiffure, ribbon headdress, neck band, bodice, stomacher, ruching, square neckline, lapels, lace. revers, wlbow length tight sleeves, bows, engageantes, vee waistline, over-skirt, full under-skirt, robe à la française