Yes it’s true, dressing up is the new dressing down – there’s a new sexy in town and it looks nothing like the Hérve Léger that’s gone before it. Think lace-up fronts, extreme strappy sandals, high splits and lattice cutouts: we’re talking subtle details that show a little skin and leave lots to the imagination. Here’s how Amanda Seyfried, singer Arlissa and Naomie Harris are bringing sexy back…