ankle warmers 

Panties. This is because panties are often found wrapped
around the ankles during sex.

For blondes, panties are better used as ankle warmers since
they are so rarely found around their waste.

ankle warmers by Gnomercy October 2, 2006

Essex ankle warmers 

Inspired by the tendency of the typical Essex girl to drop her drawers at any given opportunity and therefore allowing them to rest around her ankles, this term refers to underwear of any type, although is mostly used in reference to thongs.

Girl 1: I'm going out on the lash tonight, I'll need a fresh pair of Essex ankle warmers.
Girl 2: Are you sure it's even worth wearing them?

Essex ankle warmers by CJinherPJs July 18, 2012