We kindly request that you refrain from using flash photography," a voice announced over the loudspeaker before the start of Alexander Wang's show. "That includes cell phones." What a bit of wishful thinking that was. Mere seconds after the overheads dimmed toward the end of the show and the black lights switched on to reveal that the models' white clothes glowed an electric shade of yellow, Twitterers took to their iPhones to share their pictures. Wang is just about as It as you can get in New York fashion at the moment, and he delivered on his reputation, sending out a focused Spring collection that put his strong, singular vision on display.