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.