Levi's 501 Button Fly Seat Back Pocket

My kids needed seat pockets for their summertime home school, I had a pair of old worn-out jeans, and my little girl got a sewing machine for her birthday last year, so I got a little crafty and decided to get a jump start on the National Day of Making with this Levi's Button Fly Seat Pocket. #NationOfMakers (See instructions for detailed ... um... detailed instructions.)
> Obviously, Levi's is a brand name, and I'm not suggesting that this is a Levi's brand product -- I'm just being clear