This is an awesome idea! And yours looks really cool, the colors and patterns work well together! I've been wanting to make myself a new purse lately, but can't decide what color... I should totally try something like this!
Ok I'm just going to say that your tutorial is one of the coolest/best I've seen. I really like how you've drawn out the steps and all! I'll have to try this, button down shirts seem to be one of the few that flatter me the most, so this is so awesome! Thanks!