Premise: How to Steal a Million is a 1966 heist comedy film, directed by William Wyler and starring Audrey Hepburn, Peter O'Toole, Eli Wallach and Hugh Griffith. The picture is set and was filmed in France, though the characters speak entirely in English. Audrey Hepburn's clothes were designed by Givenchy.
Hypothesis: Givenchy designed clothes for Audrey Hepburn prior to the 1966 film