Leather Long Wallet Billfold
You can have this acrylic pattern from here:
http://www.leathercraftpattern.com/Acrylic-template/acrylic-long-wallet-template-A-61
The finished size is: 7.9" x 3.9" x 1.2" (20cm x 10cm x 3cm).
Advice:
Leather: We advice 2.0mm (5oz) leather, size 30cm x 20cm. 1.0mm (2.5oz) leather, size 30cm x 80cm.
Hardware: 201snap x4.
Tools: If you are a new leather player, try to considerate to have tool kit here: http://www.leathercraftpattern.com/leather-tools-leathercraft-tools/leather-tool-kit/leathercraft-tools-leather-craft-patterns-leather-art-leather-carving-tool