Snow camo is probably some of the most effective in the world. When you're in a snowy environment, it can be difficult to conceal yourself, until you grab a pair of these bad boys. If it's good enough for the Norwegian Army, it's good enough for anyone in any snowy environment anywhere.
NOTE: These are used surplus items, so please allow for small tears, stains, and other minor imperfections. That being said, you won't receive a derelict piece of crap that you can't use. These are meant to be worn OVER a uniform, and are adjustable via a drawstring in the waist. Most have pocket slits for access to side pockets, and a piss flap in front for obvious reasons. Various years and manufacturers. 50s through Recently.