When it comes to your waist, the golden rule is to keep it cinched. Perhaps that’s why bold belts and belt bags (previously known as the un-sexy fanny pack) have been making their presence felt on Fall/Winter 2018 runways — from Versace, to Marc Jacobs and Gucci. Wear a belt with a flirty dress or an oversized shirt, or under a masculine blazer, to help create the illusion of an hourglass shape. We show you how to do it right.