When it comes to the art of costume design there is one name - Milena Canonero. She is responsible for the looks of A Clockwork Orange (1971), Barry Lyndon (1975), The Shining (1980), Chariots of Fire (1981), The Cotton Club (1984), Out of Africa (1985) and most recently, Marie Antoinette (2006), for which she won her 3rd Academy Award. She also did the costume design for the television series Miami Vice. She emphasizes color palette and working closely with set designer. See an analysis of costume in A Clockwork Orange here.
Qui êtes vous, Polly Maggoo? (1966) by William Klein is a vintage classic with unique costume design. The French film centers on a model, followed around Paris by a film crew. The opening scene features a show by designer André Courrèges.
Boom! (1968) was an entirely unique project shot on the island of Sardinia. Adapted from a Tenessee Williams play, it features a memoir writing, aging actress, played by Elizabeth Taylor. The look was a combination of "timeless" Italian modernism with Japanese Kabuki. The remarkable costumes that resulted are the star of the film. "Tiziani of Rome” is credited as the designer. Tiziani however was essentially an American owned label that was “ghost designed” by Karl Lagerfeld.