Leather Passport Case
You can have this acrylic pattern from here:
http://www.leathercraftpattern.com/Acrylic-template/acrylic-template-card-case-A-98
The finished size is: 5.5" x 3.5" x 0.8" (14cm x 9cm x 2cm).
Advice:
Leather: We advice 2.0mm (5oz) leather for Surface, size 15cm x 20cm. Welt leather is 1.0mm(2.5oz), size 15mm x 18mm.
Hardware: No need.
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