A shape-shifting journey through a hedonistic and wildly creative decade in the life of Yves Saint-Laurent. Over the course of the film, the couturier—convincingly embodied first by Gaspard Ulliel, and later by Visconti stalwart Helmut Berger - becomes a myth, a brand and an avatar of his era, moving through a string of ateliers and nightclubs whose centers of gravity all seem to realign around him.