For Spring, the question on designers’ minds was: What would Yves Saint Laurent do? Everyone from Marc Jacobs to Gucci‘s Frida Giannini took pages straight from the late great’s playbook, showing seventies-inspired designs. There was no lack of jumpsuits on the runways, but in contrast to recent seasons, these were more Studio 54 dance floor than airplane hangar or mechanics’ garage.

Trussardi 1911‘s Milan Vukmirovic told Style.com, “The jumpsuit is great for evening because it’s a cool, all-in-one version of the tuxedo. It makes women look sexy.” At Hakaan and The Row, plunging necklines added an extra dose of glamour. If you’re going for something a little less racy, follow the lead of Celine‘s Phoebe Philo, who tossed a blazer over her strapless jumpsuit to accept her Designer of the Year prize at the British Fashion Awards.

Click for a slideshow and tell us if you’re going to get a jump on the Spring trend this New Year’s Eve.