It was super easy, too! This is from one pair of size 6 jeans. The only thing missing is the belt to put around the waist. It will also look better after I wash it, so the edges are all frayed.
I didn't have an extra pair of jeans, so I went searching at Goodwill. I was pleasantly surprised at the quality and quantity of women's jeans they offered. These are Nautica brand with absolutly nothing wrong with them. They looked almost new. I knew I was going to hack them up, so I didn't want to spend a lot of money. I think this pair cost $4.
In all, this project only took a couple hours. It was great fun to destroy something and then rebuild the same thing into something new.