NoHairNoFair,
That's a good choice. Any silk or satin pillowcase will work. Cotton pillow cases do 2 things to your hair system. First, cotton is very absorbent and it 'wicks' the oil from the hair causing your unit to become dry. Second, if you look at cotton fibers under a microscope, you'll see many scraggly threads that 'hook' the hair and cause it to break. Switching to a satin or silk pillow case greatly minimizes these 2 issues.
Regards,
John
http://toplace.com