Not sure if that's what they're called. A photo of some guys wearing them, on a beach, just came up in my Facebook feed. I've done a bit of googling to find out the dickens they are and found the link below.

I can't wait to get my own and just wanted to share it with my pals on DiS.

http://www.bitterwallet.com/wp-content/uploads/2014/04/wtf-thong.jpg