This costume was first seen in the episode
Dopplegagland of
Buffy the Vampire Slayer in February of 1999. An original sketch of this costume can actually be found in
Buffy the Vampire Slayer: The Watchers Guide, Volume 2 by Nancy Holder. The gown was used again in 2006 on the television show Bones, on an episode entitled
The Man With the Bone, where it appears that just a little bit of white lace has been added to give a little bit of length to the sleeves.