Description:Brazilian-born designer Francisco Costa created a mysterious mood for Fall 2013 with midnight blue and black as the signature colors at his Calvin Klein Women's runway show on Thursday (February 14) at Mercedes-Benz Fashion Week in New York. Costa gave his structured coats, tailored skirts and dresses an edge with military trim and accessories. Black boots, some in biker mode, completed most of the 33 looks on his fall runway.(0:57)