This is an awsome idea for a thread. For me the sexiest nighties arn't the see through ones but the short satin kind. It makes me have to imagine what I can't see, and as she moves I can't stop staring hoping to see a flash of her goodies.
Kind of like this one without the split in front.
http://thumbs3.oneclickchicks.com/9/2/5/1/5/1529616.jpg