I just saw this amazing concept of an improvised burlap hood on dayztv.com (credits to Whisky123) and thought it really needs to be added into the game:
http://www.dayztv.com/pic/dayz-burlap-hood-description-concept/
If you add this (which I hope you should), it should be crafted first before making the improvised ghillie hood with netting and grass on it.
Speaking of grass, after you've inserted the netting onto the crafted burlap clothe, you'd need to go find talll grass, that can be placed onto a burlap clothe, which will turn into a desired ghillie clothe.
Also would be cool if you could craft an improvised face mask variant of this hood, which will cover you mouth and nose, just like the balaclava.