I can remember the early ' 80s we wore blue jeans and whatever coat we had and got just as many deer then as we do now.
LOL! Yeah, but then the deer got smart!
While deer don' t see color, they do see shapes and patterns. Camo serves to break up your outline and help you blend in better with what' s around you. Oregon doesn' t require orange, but it' s a good idea. I would think camo with some orange worn also is still harder for deer to see than jeans and a t-shirt.