Scent, noise and movement are far more important than whether or not you're wearing camo patterns.
Don't use deodorant, scented soaps/body washes/shampoos, wash your clothes in fragrance free (sensitive) washing powder with white vinegar in the fabric softener compartment (it helps rinse the detergent residue away). Smoke seems to help - whether it masks your smell or the ash particle absorb scent (think charcoal filtration) I'm not sure. Control your noise when you're moving, don't make sudden movements or make eye contact, try to seek cover to break up your outline.
Cams don't hurt, but they don't help unless you've got the above stuff sorted first. Once I was sitting on a log about 1m beside a path talking on the phone when a Chittal deer (who was alert from others I was out with) trot past me. Of course I didn't have a gun. He stopped about 5m away, I slowly turned. It was only after I made and held eye contact for a second or so that he noticed me and then bolted. I was wearing plain brown pants, green long sleeve shirt and had a desert tan backpack on.