You can download this pdf pattern from here:
The finished size is about: 11.8" x 7.9" x 0.4" (30cm x 20cm x 1cm).
Hardware: No.3 zipper 20cm x1, No.3 zipper slider x1, No.5 zipper 60cm x1, No.5 zipper slider x1, Fabric.
Leather: 1.0mm (2.5oz) leather about 80cm x 42cm.
Tools: If you are a new leather player, try to considerate to have tool kit here: http://www.leathercraftpattern.com/leather-tools-...
Step 1: First, Let Me Show You How to Make a Zipper.
Step 2: Cut All Pieces From Pattern and Punch Stitching Holes.
Step 3: Make the Card Slot.
Take this instruction as sample: https://www.instructables.com/id/Leather-Clutch-1