Fabric - less than 1 yard but I got 1 to be safe
(also make sure you have your yoga mat handy for measuring purposes)
My first step was to see what size fabric I needed. It's a rare day that I actually take out measuring tape to do this but it's probably a smart thing to do. This technique worked for me...
Next you're going to take that entire piece and fold it in half right sides together (thats actual sewing lingo woo!!) Sew the two edges together but be sure to start your seam AFTER the folded down part because thats going to be where you feed through your drawstring later. Kapeesh?