Yoga Pants Built a $48 Billion Industry That’s Replacing Jeans

The first pairs of yoga pants Lululemon sold in 1998 were a simple item for women to wear at the studio. They were a mix of nylon and Lycra—synthetic elastic fibers that provided the stretch and softness needed to manage all those sweat-inducing contortions during a lengthy session on the mat. Yoga, first as an…