Materials for this project were:
7oz Vegetable tanned leather
Leather dye (brown)
Obviously you'll need the necessary tools like a knife, punch (or drill) and hammer for the rivets, and a needle for your thread.
I used my iPhone wrapped in a thin sheet of cellophane to rough measure out the shape of the holster, cut large and trimmed later.
In the Diagram, the red lines are where I thinned the leather to make it fold easier and make a crease. The dotted green lines are stitching, and the yellow circles are the copper rivets. Again, it's crude, but its all I got!
Maybe one day I'll make another, and do a full step by step instructable. The second one is always better anyway! But until then, enjoy.