Trust us. It's time to throw out that Velcro wallet you've been carrying around in your back pocket since college. There are all sorts of wallets to choose from -- large ones that are big enough to hold a passport to simple money clips that just hold a few bills. You can even have your initials engraved on your money clip to give it some class.
It all depends on your needs. One thing that isn't fashion-forward is a giant bulge in your back pocket. Avoid the urge to put everything you own into your wallet. If you're afraid you may end up on "Hoarders: Wallet Edition," buy a money clip, and you'll be forced to pare things down.