There is a brief discussion of Lady Anne's family in her husband's Wikipedia article. Her article in thepeerage is here.
Anne Templer's dress has a pale green vest with sawtooth straps over a full-skirted dress. A wide waist band adds the appearance of a basque bodice.
Keywords: 1786, Romney, Anne Templer, Anne de la Pole, Templer family, de la Pole family, British, bouffant coiffure, cap, chemise, modesty piece, square neckline, elbow length under-sleeves, cuffs, dress, sweetheart neckline, elbow length full sleeves, waist band, full skirt, vest, square neckline, strap sleeves, buttons, shoes