From Thread Theory:
Sew a minimalist take on the classic bifold wallet. This design is very simple to construct because it uses only two pattern pieces to result in a myriad of pockets! The bifold wallet includes all of the necessary details: A large bill pocket, four card slots, and an optional zippered coin pocket. Discreetly personalise the wallet by choosing a contrast insert to hold bills.
Stitch this wallet up in just a few minutes using fabric, felt or specialized materials such as leather, Tyvek or Kraft-tex. Separate instructions and pattern pieces are included to suit your material choice. The zippered coin pocket may only be added to the fabric variation.