Introduction: Leather Billfold
You can have this acrylic pattern here:
http://www.leathercraftpattern.com/Acrylic-template/acrylic-short-wallet-pattern-A-108
The finished size is: 4.3" x 3.7" x 0.8" (11cm x 9.5cm x 2cm).
Advice:
Leather: 2.0mm (5oz) leather for surface, size 25cm x 10cm.
1.0mm(2.5oz) leather for lining, size 27cm x 30cm.
Hardware: 5cm x 8cm plastic foil.
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