I found an exceptional video series on youtube; The art of camouflage
This series mostly covers ghillie/bushrag/yeti suits.
They cover absolutely everything, from starting it from scratch, to how to use your finished ghillie suit, it also teaches camouflage theory, movement techniques and many more aspects of camouflage.
Without further ado...
YouTube- The art of camouflage; part 1
Hope this is useful.
Eldin