All text and photos are the intellectual property of Rae Hoekstra of http://made-by-rae.com; you may link to this tutorial as long as you give proper credit, but please do not copy content for distribution or use on your own website. Thanks!
Step 1: Measure Head Circumference and Cut out fabric
Cut two rectangles out of two different colors of fleece as follows: the width of each rectangle should be the head circumference plus 1″ (for seam allowances) divided by 2. The height of the rectangle should be the width plus 3″ (see picture). Before cutting, make sure that you orient your fabric so that it will stretch more when you pull across the width of the rectangle than when you pull across the length.