a camo pattern that breaks up all solid masses
Use that one. I do. Like you say, it breaks up the large patches of gray. I think it's easier to be successful with blaze orange picnic tablecloth during the rut, or in places overrun with deer, or when hunting over large fields. But if they're scarce, in the woods, or not rutting, and thus more wary, you want every possible advantage. Both my headcovering and vest or jacket are camo-blaze. You can just buy an el cheapo all blaze vest and spray paint some random black stripes on it - that's all you need to do really. Just make sure the paint has a few days to fully dry, and then wash it, so that there's no scent to it.