This thread is 16 years old. But I think he did a decent job explaing. Grab a bunch of paint and go at it. My guess is this is like military camo, that doesn't duplicate a leaf but has bunch of colors that blend in.
One thing though is finding the right material in a non hunting fabric.
What might be interesting is wool. Don't see much of camo wool. Could take some and just tie dye it almost, and it might make decent hunting clothes. Might also work for hoodies. Not sure about the whole paint a twig bit, but just cover it with some dark colors. I also don't know about being so good, you buddy didn't know you where there. Might want to take his gun, until he sobers up.