I don't fully believe in the UV stuff and how studies claim deer see. The only reason I say that is because i hunt a lot of low trees. 6-14 feet and i've never had a deer look right at me if i'm not moving. According to claims from companies like Atsko, makers of UV blocker, they claim you'll look blue and look like a blue blob to them. I don't believe that to be true or deer would be jumping out of their skin in lower light conditions. I just don't ever see that to be the case.
A good camo when foliage is down is worth it's weight in gold in certain situations. Ladder stands for example. If a deer is coming from the side of you, you are off the tree 2 feet....AND you are wearing a dark camo, like Mossy Oak Break up, they'll see a blog and know something is odd. I've been there. Everything situation calls for a different method. If anyone is a ladder stand hunter, personally i'd think your camo is one of your best fiends, open pattern camo. Don't be a blog. I'm not saying ALL deer are going to see you as a blog, younger deer are stupid, you will be able to get away with more. Now you have a mature buck, say 3.5, years old or a mature 2.5+ year old doe, they'll pick out that something is not right. Only reason i know is I've been there. Others have as well. Take if for what it's worth.