From eBay; perspective effects and distortion corrected with Photoshop and sepia tone removed.
The Governor General's wife wears a complex fashionable coiffure, with a possible hair ornament, and a filled-in square neckline in this print. A way of thinking of her bodice is that it has an opaque partlet with buttons filling in a square neckline.
Keywords: 1879, Princess Louise, Marchioness of Lorne, Duchess of Argyll, Princess, Hanover family, Sutherland family, British, curly coiffure, high neckline, ruff, bow tie, lace, partlet, modesty piece, ruching, buttons, square neckline, close sleeves