New York Fashion Week began with news that Joseph Altuzarra sold a minority stake to Kering—making him the latest young designer to be tapped by a big-name conglomerate. ­Remember the acquisition craze of the ’90s when Marc Jacobs, Michael Kors, Narciso Rodriguez, and Tom Ford were snapped up by European houses? It feels like that now.Yet who could have guessed as the days unfolded that the ’90s would fully boomerang back, as runway after runway served up its own ode to the decade? Perhaps it was inevitable. Just as the last generation looks to the ’70s—we’re looking at you, Kors and Ford—this one considers the ’90s its proverbial madeleine.For spring 2014, the nostalgia trip included both ’90s minimalism à la Helmut Lang 1.0 and sporty street ­culture. The former piggybacks on the pared-back vibe that Céline’s Phoebe Philo kick-started. From Narciso Rodriguez to