Designer Zac Posen marks 10 years with a sharp new collection

It felt like a rare moment of tranquility for a designer who has often been a sartorial lightening rod for both praise and criticism. At his September show during New York Fashion Week, Zac Posen sent a parade of lux gowns down an al fresco runway overlooking the plaza at Lincoln Center. Flowing, ethereal gowns of taffeta, tulle and satin floated cloud-like in the dusk.