From www.findagrave.com. Their image was slightly out-of-focus or otherwise blurred so I added sharpness and changed other settings to bring out available detail.
Lady Hester wears an earlier 1770s coiffure, characterized by sub-astronomical heights while still elaborate and, as in her case, jeweled with swagged perals. Her neckline is filled in with a fichu while the neckline of her bodice is trimmed with a thin band of ruching.
Keywords: Hester Grenville Pitt, Hester Grenville, Grenville family, Pitt family, Baroness, Countess, British, high straight coiffure, hair jewelry, fichu, vee neckline, lace, square neckline, ruching, bows