Moth and the Flame is a Silly Symphony short film released on April 1, 1938.
[1] A group of moths invades a costume shop through a badly plugged hole in a window and makes quick work of the contents.
A male moth ignores his lady to chow down on a hat and she's soon seduced by a candle flame, which rapidly spreads.
The short was released on December 19, 2006, on Walt Disney Treasures: More Silly Symphonies, Volume Two.
[1] Prior to that, the featurette also appeared on the Walt Disney Cartoon Classics Limited Gold Edition: Silly Symphonies VHS in the 1980s.