Tsarevich Alexander was the son of Emperor Alexander II and Empress Marie Alexandrovna of Russia.
Princess Dagmar was the daughter of King Christian IX and Queen Louise of Denmark.
Alexander and Dagmar married on October 28, 1866 in the Imperial Chapel of the Winter Palace in St. Petersburg.
Dagmar's dress would have been a formal cloth of silver court dress.
1866 Dagmar's wedding to Grand Duke Alexander | Grand Ladies | gogm