I'm not sure I'd like to speculate.

( Batsgirl, Tue 25 Jan 2011, 18:35, archived)

I'm thinking it's either tights crossed with leggings or trousers.
But think the first one is more likely.
( Spider Fucking Riviera got stiches for a knife wound for the first time, Tue 25 Jan 2011, 18:40, archived)