Camo patterns and clothing has really exploded in recent years.  But if you look at pictures from back in the day they wore jeans and red flannel shirts.  I think if you were to wear darker colors all would be OK.  The camo hipe could have to do with the animals are alot more prssured now then they used to be, so as hunters we look for every edge we can get.

My observation has been the same as JSmitty's.  I've also seen the best camo being completely usless to hunters out at a distance because they make a lot of constant, deliberate, and excessive movements. Even the best camo won't do you any good if you don't know how to move through the vegitation.  Stillness around game animals is much more effective than the best camo.  Stillness goes a long way towards not being detected by game. I also believe that Camo is useless during rifle season when you are required to wear a certain amount of Blaze Orange anyway.  Camo is only as effective as the person who's wearing it. 

I find that Drab colors work very well.  Colors such as Coyote Brown, Carhartt Brown, Sage Green, muddy Olive Drab, waxed Khaki, etc all work well out west and Sage Green is excellent for use in lots of the southwestern type vegitation. I've also seen where Multi-Cam camo pattern works virtually in any type of cover, terrain, or vegitation.  But this is what we with humans eyes see.  I don't think anyone really knows for sure just exactly what biggame animals see or what stands out to them.  One day reasearch might be advanced enough to find that animals actually see vegitation better than we think.  That would be funny to find out that in our great quest to conceal ourselves while hunting we've actually been making ourselves more visible all along. For rifle season Camo isn't all that much of a concern for me.  But I do take my choice of camo very seriously for waterfowl hunting.  Excellent vision is a birds greatest sence.

For the first 5 years that I bow hunted in the 60's all the cammo that we had was flannel shirts with dull colors in them and they worked.  I personally believe that all you need is clothing that breaks up the solid lines  and is dull and doesn't reflect light. 

I wish I would have invested in the camo business some years back. I don't think it's the difference of being successful or not. I think you still have to hunt where game are, place good shots, not smell like perfume, etc. and put the best stalk on the game you can. I guess camo is appealing cause it's another cool element of being in the outdoors.