When you wear a tie, it's only serving as decoration, but that doesn't always have to be so. By cutting the back of the tie and stitching in a pocket, you can carry credit cards, cash, business cards, or anything else you can think of.Not only can doing this potentially take a load off the pockets of your slacks, but it could work extremely well as a mugging precaution, too. I just wouldn't try it on an expensive tie before practicing on some cheapies first.
Check out the link below for more pictures and instructions.
Man Crafts: Tie Storage Pockets [Dollar Store Crafts]