One of my favorite films of all time. The script says that cat burglar John Robie is early thirties and muscular. Grant played it to perfection in his mid-forties without muscles but with complete feline smoothness of movement (watch him descend the stairs of his villa in a hurry as the police arrive). Grace Kelly is improbably beautiful in every scene. The DVD of this film has a long "Making of..." vignette that discusses the clothing for the film, as well as its costume designer. The costumes were by the great Edith Head, who loved to do male costumes for dancers like Danny Kaye, but had no involvement with Grant's clothing. He started filming on Day One wearing a (presumably Brooks) buttondown, but the French script girl commented that no one in France wore BD shirts, and Hitchcock compelled a wardrobe change to the scarf/pullover combination. This despite the script explicitly stating that Robie is a transplanted American. The suits and tux were Grant's own, which may mean that they were Kilgour or, if I'm recalling his California tailor postwar correctly, Hollywood tailor Sy Devore.