How to look slimmer — instantly! Goal: Show off a svelte figure. If you need extra help tucking in that tummy, a body shaper is your best bet. The In-Power Line Super Higher Power Tummy Control Shaper undergarment by Spanx ($38, nordstrom.com) easily slips over your midsection and thighs to magically slim both areas. Bonus: Shapewear also prevents unwanted jiggle.