The Happiest Millionaire is a 1967 musical film starring Fred MacMurray and based upon the true story of Philadelphia millionaire Anthony J. Drexel Biddle. The film received an Academy Award nomination for Costume Design by Bill Thomas. The musical song score is by Robert and Richard Sherman. The screenplay is by AJ Carothers based on the play that was based on the book My Philadelphia Father by Cordelia Drexel Biddle. This was the last film with personal involvement from Walt Disney, who died during its production.
Costume Designer Bill Thomas, whose film credits passed the 200 mark in 1965, created more than 250 lavish costumes for the principal "Millionaire" players alone. More than 3000 complete outfits, valued at $250,000, were required for the entire production.