Her article in thepeerage states she was Luise Friederike Auguste von Alten’s daughter, married William Alexander Louis Stephen Douglas-Hamilton, 12th Duke of Hamilton in 1873, and then married Robert Carnaby Forster in 1897.
From wikitree.com/photo/jpg/Montagu-147; removed monocolor tint. Also posted to the Bustle Periods - 1870 to 1890 here.
Lady Mary Louise poses in a complex dress with numerous flounces and a blonde lace over-bodice. The complexity of this dress rivals that worn by Princess of Wales Alexandra at about the same time.
Keywords: 1883, Elliott & Fry, Mary Louise Elizabeth Douglas-Hamilton, Lady Mary Louise Elizabeth Montagu, Duchess of Hamilton, Lady Forster, Montagu family, Douglas-Hamilton family, Forster family, Duchess, British, wavy coiffure, necklace, under-bodice, modesty piece, sweetheart neckline, three quarter length under-sleeves, lace engageantes, bracelets, lace-trimmed over-bodice, three quarter length close sleeves, flared cuffs, over-skirt, flounces, lace-trimmed flounces, bustle, paddle fan