I think it helps a great deal.they can see a nat blink at 100 yards.LOL[].so what do you think they see you do?
all kidding aside,it helps.I had an uncle once (Passed a few years back) never wore camo of any kind. he wore blue bib overalls with the tannish brown jackets.the ones with the pockets at the very bottom, with 5 buttons down the front.you know the farmers clothing.

he took more turkeys and deer than anyone else around.he tipped the scales at 350 lbs till his death. you would be on a deer stand and all of a sudden you look up and he was standing 25 yards from ya.you wouldn't even know he was anywhere around,blue and brown cloths.

camo is an aid just like any other part of you gear. just not absolute.