I agree with GB. When it comes to scents and cover-ups, we're all being marketed to and it's all a big gimmick.
When I hear guys rant and rave about their scent lock suits and such, the first question I ask em' is, "What are you going to do about your breath?" The ones that are really gullible respond by saying, "I bought the scent lock mask too!"
The only way you MIGHT keep a deer from smelling you if he is downwind is to crawl inside a large garbage bag or tupperware container. Only problem then is, you will suffocate.
The above average height of a treestand is a much more practical solution to keeping your scent away from a deers nose, but if you're bowhunting it can present a whole new set of problems if you get too steep of a shot angle.
Best advice is learn to use the wind, and base your hunting strategy around the wind.
For those guys who say, "Yeah, but where I hunt the wind swirls and is constantly changing direction." To them I say, well then the deer are probably safe from any harm unless you just happen to get lucky before they figger you out.