I had some leftover overshot from a weaving project I did last year so I put it to good use by making handcard covers. It was really easy to make, just took a bit of time. I bought some cotton fabric at fabric store for the lining, laid the handcards on the fabric to determine how large to cut. I overlapped one side and cut a slit in the middle of one side, sewed the lining on, sewed some velcro to close it and voila!
Here's what they look like without the cards: