Breaking up your outline, keeping odd sounds down, and not revealing movement is key. I can testify that movement at close range will send them running for the hills, regardless of how good your camo is. Also, it is said they see blue, so don't wear blue. Keeping your distance, if you can, is also key. Sound and light intensity drop off according to the square of distance. So twice as far = 1/4 as much light and sound. Otherwise, I think camo is most important to those selling it.