When it comes to comfort, nothing compares to stretchy leggings this time of year. Perfect for workout classes and casual lounging sessions, the casual wardrobe staple is super flattering and slimming regardless of where you wear it. Earlier this fall, Halle Berry posted a gym selfie, and we immediately spotted her Alo Yoga Airlift Leggings. With a sweetheart shape along the waist, these leggings are just as chic as they are functional.