Step 1: Tools
You will need:
leather punch (recommended)
Step 2: Select a purse.
Lots of metal on the purse helps, and leather is better than vinyl (since it is going on your head the leather breathes better and is less scratchy) . The purse should be at least 12"x10" to fit your head when cut out.
Be sure to parade around the store with several purses trying them on your head ( in front of the mirror with the most people..have fun) .
If you can find one with a nice arch where your neck goes, great.
The measurements on the greyscale picture are accurate, if you enlarge it and print. (Leave 1/4 inch for sewing)
Step 3: Symmetrical Cutting and one seam to sew.
Trace the right shape with some leeway for sewing, cut out the leather and then pin or tape it together backwards to sew with the stitching on the outside. Most of the sewing will be around the crown of the skull. With optional reinforcement sewing elsewhere.
The red dots are where I did most of the sewing. My machine wont do leather so i punch starter holes all along the area to sew with a needle. (close together about the length of long stitches )