When Dan Black goes on stage at Webster Hall tonight to open for Robyn and Kelis, he'll wear head-to-toe Dior Homme: tight black jeans with zippers at the ankles, lace-up sneakers that zip up the back, a Halloween-orange tank with a draw string at the bottom, and a black suit vest that zips up asymmetrically. We know this, because we were with him in the Dior showroom yesterday when he picked it out. British-born Black, who was just nominated for two VMA awards, plays the second of two shows tonight. When he arrived at midnight the day of his first show he was sick and had nothing to wear. So between doctors appointments and performing in front of a couple thousand people, he popped into Dior, who has been dressing him in Europe and for some of his shows on the West Coast, and we got to tag along.