Ceremonial court dress belonging to Empress Alexandra Fyodorovna. Made by the workshop of O. Bulbenkova (?), St. Petersburg, Russia. Late 19th to early 20th centuries. Velvet, satin and gilded metal thread. State Hermitage Museum (links: https://www.hermitagemuseum.org/wps/portal/hermitage/digital-collection/08.+Applied+Arts/1263422/?lng=en, http://www.hermitageline.ru/ru/blog/view/bal). Other photos are via Ghosts of Imperial Russia's Tumblr. CLICK FOR VERY LARGE, HI-RES IMAGES.
Three centuries of Russian court jewellery is unveiled in Jewels of the Romanovs book