Leggings are tight stretchy trousers that cling to the leg. A pair of leggings, wear leggings, black leggings.
The word is plural only, like trousers. They were riding and working wear for centuries before becoming exercise clothing, and the argument about whether leggings count as trousers has been running for a decade.
1nounleggingsTight stretchy trousers that cling to the leg.
“She wore black leggings and a long jumper to her yoga class.”
leggings is a garment.
legging comes from leg + -ing.
Etymology from Wiktionary, CC BY-SA