Jeggings were brought on by the resurgence in style of skinny jeans in the late 2000s, when a higher demand for a tighter style of pants came about.Since jeggings are typically made of a cotton/spandex blend, (cotton being the primary fiber in most denim, a kind of serge), they are often worn on their own as opposed to under a skirt or dress. Some jeggings have front fastening facilities while others just have an elastic waistband and no pockets.