Ardmore,
Sure--we can do that with a full cap. Making the hair system 'less than perfect' is a great way to add realism. And recession is great because non-wearers never think that a hair wearer would want to still have recession. When hair is picture perfect it draws attention from people...'nobody has hair that great.' So a little recession and even not combing every hair so that is is exactly in place adds a touch of the 'real world.'
Regards,
John