I think he has some sort of ghillie on his back. If so, I would recommend a ghillie hood, to break the outline of your head and some on your arms aswell.
A ghillie wrap for your rifle would be nice aswell, instead of using a roll of burlap.
This breaks up the outline of your gun, instead of making it a bigger object which is easier to see.
Also wear some gloves and goggles, and if you can, pull that balaclava over your nose.