"The Blue Dress," 1890s, worn by Empress Elisabeth. The empress wore the dress at her summer home on the Greek island of Corfu; the dating indicates that it was worn after the death of Crown Prince Rudolf, proving that, contrary to popular belief, her wardrobe did not just consist of black items after her son's suicide.
"1878 - 1890 Victorian." This looks like a modern-day movie costume (for Anna Karenina maybe? Oogh, that train), and I think the date may be off, because the bustle looks like the earlier style. Again, not mourning, but close.
Purple velvet coat, 1895-1900. Medieval-style collar. Entirely covered with dramatic sprays of an English wildflower called Sweet Cicely that are hand-embroidered in yellow and green silk, with petals of white felt.