Above, Jeanette MacDonald as the old lady in the 1937 film, Maytime.
Thanks to Claudette, one of our Canadian members, for writing in! She caught a glimpse of Jeanette’s “Miss Morrison” dress worn in a third movie, Madame Curie (1943), starring Greer Garson. Coincidence or not, the other film it was used in was another Greer Garson film, Blossoms in the Dust (1941).
In Madame Curie, you can see the dress about two minutes into the film, at a party hosted by an elderly professor (played by Albert Bassermann). His onscreen granddaughters, two adorable young twin girls, attempt to serve Walter Pidgeon some coffee or tea, and a moment later the professor’s wife rushes over – in Jeanette’s dress. (Trivia note: the woman wearing the dress is Elsa Bassermann. She was married in real life to her onscreen professor husband, Albert Bassermann, probably better known to you as Van Meer in Alfred Hitchcock’s 1940 Foreign Correspondent.)
Screenshots of the dress in Marie Curie are shown below.
You can also see color photos of the dress from Blossoms in the Dust at this link.