OD is too green to be used closer to winter. Ranger Green seems to be fine for that with its lighter, more grey colour. And if they can spot my rig, they can sure as hell spot my rifle, which essentially means rig colour is redundant, as long as it is not blatantly different from the surroundings. I personally ID targets based on goggles, helmets and guns. I find them the easiest to spot. With rigs, I usually find the solid colour ones HARDER to spot once shade gets on them. With multiple colours, it is more likely that you will have a light patch in the shade, that should be dark.
Peace through superior firepower.