Good news, there are a lot of photographs, paintings and even a replica of the coronation dress that Elisabeth wore when she was crowned Queen Elisabeth of Hungary and Bohemia.
As the Hungarian were concerned, the coronation of Franz-Jospeh and Elisabeth as king and queen of Hungary in 1867, was the most important event ever. So a lot of photos where taken by the official court photographer, Emil Rabending.
Unfortunately the photos are in black and white, so the scholars are now arguing about the colour of the dress, is it black, or is it blue?
The gown of velvet and white silk was designed by the Parisian couturier Charles Frederick Worth, one of Sisi's favourite designers (and of most of the European royalty at the time).
The design was based on the traditional Hungarian gala dress that had been worn at the Hungarian court since the fifteenth century.
Even though there are photographs of this dress, the painters at the time gave their own twist to it, so as you can see here that they did not always get the details right!
Makes you wonder how accurate other paintings are, where there is no photo evidence to back it up!