1 Fat Quarter of Fabric
1/2 yard of coordinating fabric
With right sides together, sew the 2 pieces together and press the seam towards the band. I found out later that you should press towards the band, so the picture it wrong but I wanted to show the backside.
*My numbers for this are slightly off because I was in a hurry and didn't trim the selvage off. So, adjust accordingly. The trouble comes when the sides of the main fabric piece are turned in to create an edge. It depends on how big you make your seam allowance. But if you're not in a hurry, think about it a little and it'll be right. I think i also would have made the straps a little longer for tying in front. It's probably fine if you're tying in back but I didn't try it.