NEW BAG: Prada is celebrating the world’s top fashion weeks — New York, London, Milan and Paris — by launching a limited edition bag. Miuccia Prada revisited the brand’s iconic, seasonal “Doctor Bag” style, which appeared on the fall/winter runway in polished calfskin, creating an exclusive thick wool version with a black, white and orange geometric pattern. The limited edition bag will hit the fashion capitals’ flagship stores the week of their shows.