Have her wear them round her ankles.

Somehow, with her red panties around her ankles, the barwench looks even sillier than if she wasn't wearing any at all. You're not sure why. Perhaps because it's clear that somebody pulled them down, which makes her seem even more ****. Perhaps having just a little bit of clothing accentuates the rest of her exposure. You're not sure, but you know you like the look.

So much for that. Now for a few finishing touches.