From the seller:
Old and authentic dress Napoleon III transformations.
The skirt has two tops (one day, the second ball) and various accessories (Polish, belt) for modifying the skirt in the circumstances.
All in very nice condition.
Only the blue silk prom corsage is worn.
Something tells me they didn't have proms back in the mid 19th Century. Call me crazy.
The above fashion plate is from 1867. Although the grey dress is much more trimmed, it also has similar lines to the extant one above. By the late 1860's, the dresses were really starting to go back and we see the beginnings of the bustle era. That is why the extant one looks so sad in the display - well, one of the reasons- it was meant to have a bustle back so that the hem was even to the floor.
The other reason is that the belt/overskirt was meant to go with the daytime bodice. Although I have seen fashion plates with the basque waist and the ball gown bodice, it was much more common to go with the daytime bodice. It's probably the reason the basque waist and the bertha collar look so funny together.
I wish the seller would have provided measurements. I've noticed lately that a lot of sellers stopped doing that. I think it's a reaction to all the numbskulls that want to wear these antique garments. I'd prefer to see the measurements and have a re-enforcement that you do not wear things that are 150 years old. Heck, even jewelry that old gets worn only for a few hours because of how delicate it is and that stuff is metal!