leg warmer 
noun
Each of a pair of tubular knitted garments designed to cover the leg from ankle to knee or thigh, typically worn by dancers during rehearsal.I especially love the leg warmer and flats all the models are sporting in the show....
- For dedicated skaters like Carrier, it's not just about the cute skirts and leg warmers.
- There were no leotards and leg warmers in sight as this modern and fresh production had the Manchester crowd in raptures.