I, too, have been sitting in the open on a flat rock and eating a sandwich when two yearling fawns and their mother came into the clearing. They got so close to me that I could have poked them with my gun barrel.
It was during the hunting season.
This has happened several times in my 40+ years of hunting.
I was not wearing camo.
I think it's because I was not moving.
Does are a lot less skittish than bucks and not nearly as wary.
As was mentioned above... I didn't appear to be a threat.
The deer family keys on
movement and shapes... camo breaks up your outline and tends to hide small movements.
The deer's eyes are tuned to
night vision and the color receptors in their eyes are the least of their senses.
They are not color blind, but
their eyes are to color, what our eyes are to darkness.
I wear camo now... but if I stink, or I move, or I make noise... the deer is outa there.
Just like the very best rifles, camoflage is meant only to
assist the hunter...
not to kill, gut and butcher the quarry.