When I was a very little boy, in the early 50's, my parents would comb my brothers and my hair with Johnson's Baby Oil before we went to bed and then put a stocking cap over our hair to "train" it. These caps were the cut off tops of my Mom's nylon's that had a knot tied onto the top where it had been cut. Then in the morning, if my Dad hadn't left for work yet he would rub our heads vigorously, what he called a "Dutch Rub", then comb our hair, making sure the part was just right.
Eddie