Notable model news on the first day of Fashion Week: BCBG used runway staples, with Irina Kulikova opening and Abbey Lee closing, and an unfortunate stumble by Arlenis Sosa two minutes in. Colette Pecheckhonova, a late-nineties "It" girl who walked in Paris and Milan last season, reemerged in New York to open Erin Fetherston. But according to our complex model algorithm, Friday was ruled by Sasha Pivovarova. After going MIA last season, the Russian finally returned to New York's runways. With her exclusive three-year Prada contract over, she opened the star-studded rag & bone show.