When hunting deer, bear and turkeys, I wear camo. Usually the old woodland pattern that I started with years ago. There are a lot of new patterns on the market, but I've never seen any reason to change. It's always worked well for me here in NY. I do have a heavy coat in Fusion 3D that I got for Christmas a couple years ago, that does the job too. I don't think camo is really necessary, but I hunt from the ground, and like the thrill of being close enough to count eyebrows, so I like the added advantage of using it. There are a lot of new materials out there too, but IMO It's hard to beat wool, and I wear a lot of it. I don't think camo is anywhere near as important as keeping movement to a minimum.
Bob