I did an online search and found this tutorial that also has a pattern piece that you can print out to help you in making these head warmers. Now, we have some large sized heads in this house so I had to make them a little bigger. Here is how I did it:
To increase the length of the headband, I added an inch to the side that is placed on the fold so actually I am adding 2" to the length since it is cut on the fold. I taped a piece of paper to the pattern to make this increase and then cut out my fleece pieces as normal. Remember to cut the fleece with the stretchiness of the fleece going in the direction of the red arrow (stretch goes selvage to selvage or side to side).
Here is how they turned out:
I added a monogram to the solid blue one before I sewed it together and the polka dot one is how it looks from the back (it tapers under the neck). The tutorial was very easy to follow. I don't think she mentioned the seam allowance that she used but I used 1/4" so that the seams would not be so bulky. Also, if your machine gives you trouble with sewing the fleece, you may want to try a jersey or ball point needle in your machine. I also bumped up my stitch length to a 3 instead of 2.5 as the fleece is bulky.
If you decide to make any, I would love to see them! You can also post them on my Facebook page so we can all see!