Here’s a wallet/cover Richard Bryan made for his Moleskine sketchbook. It’s made out of duck cloth and elastic banding material bought at a fabric store. There are two pockets on the front, one for cash, one for credit cards. The material is taut enough to hold everything securely in place. The second picture shows how the inside front cover is sewn. The back cover has a single strip of elastic banding and is used to hold Moo Cards. The fourth image shows how the inside back cover is constructed. You could easily modify this design for use on a Maker’s Notebook.