 French designer André Courrèges created many custom pieces for the film, such as the swimsuits worn by Schneider and Birkin.It was the first of the nine films Delon and director Jacques Deray made together, and the only one the star didn't produce.It also marked the onscreen reunion of Delon and Romy Schneider, his co-star in "Christine" (1958) and romantic partner in 1958–1963.