I used to wear all my old Army and Marine camo, but pretty much not anymore. Over the past couple years I have acquired lots of wool and it really seems to work better, in addition to keeping me warm.
In the early season I'll wear old cammy pants maybe or just jeans.
The wool just seems to absorb light, the same way a deer's fur does, and I've had them look right through me as if I wasn't there....wearing plaid wool.
You can find the wool pants on various auction sites or surplus stores. Look for M1951 wool pants, and get a size bigger than you normally wear so you can put your long johns on underneath. You can also find the european heavy wool military pants too, just be careful cause their sizes seem to run small.
PM me with your size...I might be able to help you out with some wool....
Russ