Athletic wear companies, fast-fashion emporiums and even some haute couture labels are trying to claim Not wearing panties with yoga pants slice of the yoga pie. To wear or not to wear underwear in addition to your black stretchy pants is only one of many questions fit ladies have. But don't get carried away. Can you wear your leggings again before tossing them in the laundry? Tap here to turn on desktop notifications to get the news sent straight to you.