I looked it up. Its like a second pair on underwear that you wear over tights when the elastic doesnt hold them up. So i guess stores used to sell maybe 3 human sizes for tights, and then circus tent size for the elephants so the obeasts would use more underwear to keep them on rather than either lose weight or just not wear tights. But now stores are catering to the monsters, so they can run around without double layering their underwear.