Tie in With Snow White?
I just watched this movie, and the moth outfit she's wearing reminded me immediately of the queen's outfit in Snow White. Then I went to the trivia page for SW and read that the queen's wardrobe was inspired by an outfit in a movie called "She" made in 1935. I haven't seen this movie and can't find any depictions of a costume like that linked to it, so I can't speculate on that tangent, but I'm damned if the costume from Christopher Strong isn't almost on the money...
"South Bend... It sounds like dancing!"