The brits got it right.
'knickers" is the correct term and sounds so much better and less gay than "panties".
But that's just me... (the fact that I'm a british expat might have something to do with that opinion)

Oh yeah, and to get back on topic (I'm never off topic am I?)... pump it up baby
(I know, I always post this link when she pumps. It's a tradition, doncha know.)