A few tricks that can help you hide fat thighs while wearing shorts are: 1. Wear loose tops that fall over the thighs to stretch the silhouette. 2. Wear flared, cycling or bermuda shorts to make the thighs appear slimmer. 3. Wear patterns and bright colors in the upper body area to distract from the thighs. 4. Wear a third layer, cardigans, coats, jackets, etc., to cover the thighs. 5. Try to avoid wearing too short or too tight shorts.