From the lost gallery's photostream on flickr.
Margaret wears a dramatic magenta or pink bodice and bow under a lace capelet and lace bertha. Magenta, a combination of red and violet/blue, was invented in 1859, the first of many, many artificial dyes. Being of two colors, it had never been seen before so it was a novelty.
Keywords: 1899, Mendelssohn, Duchess Louise of Connaught, Princess of Prussia, Prinzessin von Preußen, Luise Margarete Alexandra Viktoria Agnes von Preußen, Luise Margarete Alexandra Viktoria Agnes von Preußen, Duchess of Connaught, Princess, Duchess, Hohenzollern family, Welf family, British, curly coiffure, earrings, lace capelet, vee neckline, bows, bodice, lace bertha, upper puffed sleeves