A long time ago, in a training regiment far far away, we were having the then current DPM clothing demonstrated to us. We were all assembled on one side of the drill square and our Troop Sergeant told us all to turn round. While we were turned away, he had one of the lads "double" accross the square (one never "walks" on "my shaggin' drill square") and place one of the old DPM crow caps on top of a short pole on the other side. When he came back, we all had to turn back round again and try to see the cap. The background was a line of trees about 100 yards past the pole. None of us could see the cap until it was pointed out to us. From then on, I've been a great believer in DPM.
However, the deer don't care, and purely to avoid looking like a soldier, I just wear plain green clothing when out stalking.