I have found an artist who drew Captain Hook in a red coat pre-Disney.
American illustrator Roy Best was contracted by Whitman Publishing Company in 1931 to illustrate The Peter Pan Picture Book, based on the play. This is the first portrayal of Hook in red that I have found, and I suspect it was the original inspiration for Disney's art design. Although the animated film was not released until 1953, Walt Disney began work on it in 1935, only to have production derailed by World War II.
Note also Peter in green tunic and tights, with feathered cap. Hmm.
Roy Best also illustrated "Saturday Evening Post" covers. And painted pin-up girls. Well, I have long maintained that Peter Pan is not exclusively a children's book.