Step 1: Cut and Sew
To measure for the hat: take a measurement up and over the head, starting from where you want the hat to rest on your forehead and ending at the back of the head where you want the hat to end. divide that number in half and that is how high you cut to the top of the hat. For the measurement across, measure around your head, cut that number in half and that is the length you use.There is no need to allow extra for seam allowance because the fabric is stretchy and you want to sew this a bit smaller than your measurements.
Place the right sides facing together turning the folds to the inside. Sew around the edges. In fact, when you sew along the edge you should sew at least a half an inch or more in.