Art: Cinderella by by Joseph Albert Colquhoun Morrison

Cinderella by Joseph Albert Colquhoun MorrisonOil on canvas, 39.3 x 31.8 cm Collection: The Stroud District (Cowle) Museum Trust Collection
Now isn't that an unexpected time period for a Cinderella? Anyone want to analyze her clothes and figure out the date on this one? Morrison studied from 1901-1904 and had a long career--at least through 1931 but I cannot find easy dates in a quick search.
Again via the Your Paintings Project.