“I’m sick of seeing myself,” says fashion legend Yves Saint Laurent (Gaspard Ulliel) in this torpid biopic. You and me both, buddy. Too long by about an hour, director Bertrand Bonello’s portrait of the French designer during his heyday, between 1967 and 1976, saunters as languidly as its subject through nightclubs, business dealings, fittings and drug-fueled bacchanals. (A suggestion: when your film is subtitled, having a translator repeating a French character’s words for the entirety of a lengthy board meeting feels punishingly redundant.)

The appealing Ulliel gives an ethereal, Andy Warhol-esque performance as the enigmatic designer (also portrayed in his later years by Helmut Berger); Louis Garrel brings his characteristic insouciance to the role of Jacques de Bascher, Saint Laurent’s hedonistic bad-idea boyfriend. Ultimately, though, “Saint Laurent” is beautifully dressed with little substance, which doesn’t do much to subvert a prevailing stereotype about the industry as a whole.