You need only about half a square foot of fabric. It needs to be reasonably stiff; denim or heavy cotton is ideal, and you may have suitable scraps in your scrap pile. You also need a couple yards of thin double fold bias tape in a matching color (or anyway a color you like). Thread, scissors, tape measure, sewing machine are the only other requirements.
Step 1: Cutting and Edges
- 8" x 4"
- 7 3/4" x 3 3/4"
- 7 1/2" x 3"
Sew bias tape to one of the long edges on each of the two smaller pieces.
Step 2: Sewing the Folds
Sew from one end up to the first fold, skip the folded bit between the pins, sew the middle section, skip the second fold, and sew to the end. The skips are to allow the areas that should match up to match before attempting the more difficult sewing of the unequal lengths, which we will do next.
Step 3: Pockets
The seams don't have to run all the way to the bottom, as long as they go more than halfway from the top, bound edge, they'll be fine.
Step 4: Finishing
Start applying the bias tape, again wherever you like, and just go all the way around. When you get to the unequal folds, put some effort into easing the longer edges in, sometimes putting in a lot of pins helps with this. You can sew those down before the bias tape if you like. You may end up with a tiny pleat or two but if you've managed to get the pleats fairly centered on the fold lines, it won't affect the wallet and it won't even really show.
That's it. The wallet is complete and ready for use. It will only want to fold up at the bottom seam at first, but if you iron it, or just carry it in a pocket for a day, the rest of the folds will settle in and it will stay nice and flat.