Thelma Todd sang a song dressed as the "Butterfly Girl" in CHEATING BLONDES.
Along with a few fellow Butterfly Girls in the chorus.
Butterfly costumes have been worn by other girls in show business.
A showgirl in an extravagant butterfly costume from Folies Bergère, Paris, 1909
Vaguely related to all this was the gown with a butterfly on it that Sally Eilers wore in the seduction scene in STATE FAIR ( 1933 ).