If wearing a 'G-String' or 'Thong' is too conservative, consider rocking a 'C-String.'  Its a new type of underwear that covers you in the front, loops between your legs, and covers a little of the crack lol.  There's no waist band, it holds itself in place thanks to a wire inside.  They retail for under $5 in most places.  Check out the different styles / colors available here.

Would you wear one?  Would you want to see your significant other in one of these?