Vitaphone production reel #6439.
The animated film was probably inspired by Busby Berkeley's musical production number "The Girl at The Ironing Board" in the 1934 musical "Dames," which featured a version of the same song and also had dancing long underwear and union suits.
The first Warner Brothers cartoon to carry the MPPDA approval seal.
The bird providing the closing whistle is the logo of the NRA, the National Recovery Administration, established by President Franklin Roosevelt in 1933. The U.S. was still in the throes of the Great Depression at the time of this short, and movies were one of the few means where the public could escape their problems, if only temporarily.
The sub plot, of the dastardly bad guy kidnapping the beautiful girl, was a popular cinematic story line at the time.