The lingerie-inspired looks we saw on spring runways like Marc Jacobs got sexier this week. Phi featured a black, sheer slip dress with red underpinnings peeking through the satin lace, while VPL by Victoria Bartlett sent out boy-short panties in neutral gray, beige, and indigo colors. Elsewhere, Zac Posen dressed Vlada Roslyakova in a sheer nude cami dress, revealing a naughty black garter belt suspending her thigh-high white stockings. Fashion is all about taking risks, ladies. Dare to be devious in fall. —Sharon Clott