Her article in thepeerage is here.
From the museum’s Web site; enlarged one quarter.
This dress and even the stomacher ornaments and neck band are made of a glacier blue material. A similar dress can be seen here.
Keywords: 1760, Devis, Elizabeth Mordaunt, Lady Milner, Mordaunt family, Milner family, British, straight coiffure, choker neck band, sacque back bodice, robings, three quarter length tight sleeves, bows, sheer engageantes, stomacher, square neckline, full under-skirt, robe à la française