Thursday designers went back to school–in some cases, literally–as Alber Elbaz commenced his second decade at Lanvin with a concise essay on those icons of French femininity, le smoking and the LBD, at the École Nationale Supérieure des Beaux-Arts. At Balenciaga, Nicolas Ghesquière earned top marks for his more-pragmatic-than-usual collection inspired by the house founder’s ballet costumes, while at Balmain, Olivier Rousteing was deemed a quick study in the pop culture of the decade in which he was born.