difference between spandex and leggings
Spandex is mistakenly used to describe a type of legging or athletic pant that's close to the body, slightly shiny and stretches. This is in reality a type of Athletic pant -the exact name usually refers to the purpose of the pant.
Leggings are usually more opaque than tights, and stockings are usually the least opaque. Leggings are considered to be more like pants than tights, so leggings can be worn with a longer top, whereas tights should be paired with a skirt.