Suck-it-In Assistance 

Admit it: When you find a pair of leggings that make you look thinner than you are, you buy them in every color. What to look for: A slightly higher-waisted V-shaped waistband to flatter your tummy line and a little bit of Lycra to help keep everything smooth. Doce Vida Fitness Inc. CEO Jordan Veatch-Goffi recommends 12 percent stretch fabric that instantly slims.