NO BLACK
There is no natural black in the bush; if there has been a fire though recently then there is plenty of charcoal around to use, best colours for the SE quadrant are pale greenish, dirty rust reddish and the natural colour of the hessian.
how big the strips are is determined by the surroundings, in grassland you actually don't want strips at all; just threads ( raffia is brilliant here intermixed with the hessian ) in mixed iron bark-box woodland a mix of threads and strips works well and if in alpine forest then a mix of strip sizes.
Just remember that in nature nothing is totally regular,
Full ghillie suits ( if properly made ) are very heavy and very hot, a short cape and hat or hood is much lighter and gives little away, my picture files are too big to post but i can email if contacted thru the site.
Regards
TedM