1. There are many types of stretchy materials and clothes on the market to make you look thinner and many actually do work. These can prevent those unwanted bulges by smoothing them out and holding you in. Think about going for briefs designed to make you look slender, clothes that have reinforced panels which can help hold the stomach in, give contours to your waist and rear, make your thighs look slimmer. Some tight skirts, pants or even an evening dress can also work.