You can use your chest hair; you can use your pubic region. Any part of the body can be a donor area for hair transplantation because it's donor dominant and the area where the hair is is how the hair will grow.
Pubic Hair Can Be Transplanted to the Scalp... But How Will It Grow?
If there's a will, there's a way! Dr. Neil Sadick confirms that pubic hair can, in fact, be transplanted to the head. Watch for more details!