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Here’s some hard evidence on Yoga Pants from Wikipedia:
Yoga pants are a type of flexible, form-fitting pants designed for the practice of yoga as well as other physical activities that involve a lot of movement, bending and stretching. They are typically worn for sports and physical exercise, martial arts, dancing, pilates, or aerobics. These pants are generally made of cotton, lycra spandex, nylon, polyester, wool, or a similarly light and stretchy synthetic material giving the pants a very smooth and silk-like finish when worn. They are usually black, tight-fitted, and have an elastic waistband folded over at the top.