Bholsa iPhone Sleeve + Wallet
Bholsa is a small Portuguese shop that makes lots of felt, anti-pilling, water-resistant cases for various devices. This sleeve+wallet combo, which features two front slots for cards and bills, is available for iPhone 5/5s and iPhone 4/4s. It looks great, protects your iPhone, and may save you the trouble of carrying a separate wallet.
Available on Etsy for $18.50.