From vvintag.es/2015/03/stunning-portraits-beautiful-women-from.html; removed spots with Photoshop.
The dress has a high upper bodice in neo-Directoire style.
Keywords: Violet Gertrude Twining Chichester, Marchioness of Donegal, Twining family, Chichester family, Maquise, curly coiffure, tiara, earrings, choker necklace, necklace, upper bodice, square neckline, vest lower bodice, Minoan neckline, strap sleeves, wrap