This one was an undertaking for me. My first zipper, first snap and first patchwork really. This tutorial is great, but I made some amendments to it. I added a zippered coin pocket with a bill pocket behind instead of the extra credit card slots.
A few notes if you're following the tutorial: I cut 10 strips 1.75" wide (but this depends on your seam allowance). Fabric Ax3, Bx2, Cx2, Dx3.
I used this zipper demo to learn, but there are lots of them out there.