Get a pair of army pants, shirt and vest you can also have a hat. Get makeup that can spread on face.
Put green mkeup all over your face then put two black lines on the front cheek, but not to far or it will spoil the costume.
Thanks to Richard for this idea.
Get a jacket that is black and brown and green mostly.
Get baggy pants the same colors and brown shoes and there you go!!!
Thanks to Darlene for this addition.