Leggings/ˈleɡɪŋz/ Definition 1 of 2Pro Tip 1/3Athletic Use Leggings are often made for exercise, providing comfort and flexibility during workouts. She picked moisture-wicking leggings for her yoga class. Pro Tip 2/3Fashion Trend Leggings are popular in fashion and can be worn casually or styled up. She paired her leggings with a long sweater for a chic look. Pro Tip 3/3Layering Piece Leggings can serve as a base layer under clothes for warmth in colder weather. He wore thermal leggings under his pants on a snowy day.