NEW YORK — Wartime espionage may be a thing of the past, but designers are reviving that infamous spy essential: The trench. And the latest versions offer more than just protection from the elements — or the enemy, for that matter. This fall’s trench looks are fitted, lean and ultrahip. Here, DKNY’s cotton coat, merino wool turtleneck and cotton and spandex corduroys. For more, see pages 6 and 7.