Class Acts

The crowd at Barneys lined up to have the tea leaves read. Derek Blasberg, natty in Burberry, was furiously signing copies of his new book Classy and making extemporaneous assessments. The question on the table: Are you a lady or a tramp?"Tramp!" he barked at Calvin Klein Collection creative director Francisco Costa, who, far from looking offended, giggled appreciatively. An oversized button—"