You can use magnets to hide the hair in the skull where you want the cap to be. That way the hair in that area doesn't affect the cap.

There was a thread posted in 2005 on how to do this.   Possibly in the last 1/2 of 2005. You might try searching for "Magnet" in 2005  and see what you pull up.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi