Marc Jacobs' Fall/Winter presentation was the perfect finale to heat up a freezing fashion week. On February 18th, at the Park Avenue Armory, he sent sixty-five looks down the runway to the rapt attention of fashion editors, buyers, and a celebrity-filled front row that included Sandra Bernhard, Juliette Lewis, Kiernan Shipka, Maggie Gyllenhaal, Emily Ratajkowski, Rachel…