NEW YORK (AP) — One of the first sights we see in “Costume Art,” the new fashion exhibit to be launched at Monday’s Met Gala, is a glittering column gown by Dolce & Gabbana, its shimmering gold sequins surrounding an image of Aphrodite. The Greek goddess stands on a pedestal, holding a golden apple bestowed on her for her beauty — a classic ideal of beauty as old as, well, ancient Greece. But the idea of “Costume Art,” which examines the dressed body through centuries of art history, is not to