Her white belt with dark jeans is a perfect match. So square: Ruth Willis cinches black her taffeta skirt with an olive green vintage Prada belt.

Cue Belty, the world's first smart belt, heading to pants-loop near you with the promise of knowing every tiny change to your waistline — in order to make staying svelte a cinch. I went waist-on ...

from Willa.Leather beaded wrap-style belt: $48, from Rhinoceros.Twenty8 Twelve by S. Miller dark brown and black skinny belts: $105 each, from Rhinoceros.Streets Ahead dark brown leather belt with ...