Starting his show at 8 p.m. sharp at the Park Avenue Armory, tonight Marc Jacobs presented his spring 2013 collection, a monochromatic study in body-conscious stripes confirming that spring's must-have accessory will be protruding pelvic bones. Stop eating now. We'll be updating our runway galleries very soon with full, zoom-able images as well as beauty shots, details, and backs; for now, click through our slideshow to see shots from the collection.