This might sound crazy, but it also depends on the scent (In my opinion) I hunt whitetails with several guys that no matter what they do they get blown. They have gone as far as being in their underwear until they get in the stand with enclosed clothes (In a bag) they get picked off the moment the deer start moving. We started experienmting with this theory....so, I would get in the same stand without showing and working all day...never got blown and killed several does like that.
I will say, it sounds crazy, it doesn't make sense, but people have different odors. Although all are danger to game, some odors are much worse based on my experience.
If you think about it, dogs, will decide if they like you almost immediately based on smell. I think their is more to this topic than we will ever know.
one last point. I read a guys post on bowsite where he was one of those guys that got picked off by mule deer no matter he did. he was hunting private and got to hunt them a ton. like my friend, no matter what he did, he would get picked off. He went on to say one night he stayed at his girlfriends house and forgot all of his normal scent free soaps. So, he said screw it and showered with this sweet berry (only thing she had) He said smelt like a girl from head to toe. He said deer were all over him..within feet, not yards. go figure...