Big ol red and black wool coats, deer can't see much of anything... Except movement.
Most people who claim to need camo IMO probably can't see deer without them getting antsy because of hunter movement.
I've stalked within yards of bucks on a crunch leaved oak ridge. Anyone Appalachian knows how hard that is, but I did it by utilizing precise timing on movement. your only camo against a deer is staying still. You could be wearing a ghillie Suit but tilt ur head an eight of an inch and its over.