A pair of thongs would indicate two thongs.
I would prefer thongs to giant granny panties. The risk of exposure to skid marks is just too high with a huge pair of grannies. [img]graemlins/hehe.gif[/img]
On the flip side of that, depending on the owner, the imagery of a thong being modeled might just be too much. While thongs shouldn't be policed like spandex, there are some who just shouldn't be allowed to wear thongs.
On second thought, I don't think people should be allowed to parade underwear in public unless they have officially attained supermodel or playboy playmate status.