Over the past 20 years the digital imaging capabilities of the clothing industry have made great gains in being able to capture and print what I call ‘photo realistic’ patterns. You can hold some of the photo realistic camo at arms length and it looks just like the scenes from nature. I think this is why a lot of people buy it. Take the same camo and look at it from 20-30 yards and all you will see is a dark blob. All those neat leaves and branchs visible at arms length disappear. Then take a large pattern. Could be a big wool plaid, ASAT or Predator, at the same distance and it will still break up the human outline. I think a lot of folks get fooled by the small patterns found in photo realistic camo, but the deer don’t.
I believe deer in heavily hunted areas have learned to ‘look up’ for danger above, and have also learned the shape of the human body outline whether in a tree or on the ground.
My favorite camo is an old wool ghillie suit from Sleeping Indian. the wool strips are big, and give much more ‘texture’ than the cotton ghillie suits. Downside is the wool is hot in warm weather.
If you’re on the ground, wear clothing that breaks up the human outline—especially the head. Have a good background like a big tree, or brush pile. Don’t need much in front of you if you are still.