I look at it a bit differently.There is no doubt that you can't completely fool a wise old buck or big bear no matter what you do. You can play the wind all you want but if the animal decides to circle downwind of a bait pile or a hunter calling and rattling, then your chances of being scented are much greater. Plus, winds are often variable in speed and direction in the woods. At least if you can minimize your odor you stand a better chance of being undetected. It's kind of the same as being downwind of someone who hasn't showered in days or reeks of cigarette smoke. You can pick them out from much further away.
So yea, the clothing doesn't not work near as well as they say, nor do all the scent killer sprays help that much to totally eliminate your scent, but I believe they are better than not doing anything. If nothing else, they give me a bit more confidence that the deer or bear who is downwind just might not bust me as readily as if I was all stinky in the stand, or it might just give me those extra few seconds to get a shot off that I wouldn't have had time for otherwise.
Field and Stream did some good tests using trained police dogs. Turns out your best odds were using cover scents and ozone.
http://www.fieldandstream.com/articl.../07/sniff-test
http://www.fieldandstream.com/articl...e-a-difference
http://www.fieldandstream.com/articl...reducing-produ
http://www.fieldandstream.com/articl...g-dog?dom=fas&
loc=hpslider2&lnk=IMG
Cheers