I wear my CF Issue Extreme cold parka. I was in a game last winter which reached -32 i believe without the windchill. our guns didn't last long, but i could have played all night.
http://www.airsoftcanada.com/gallery...php?i=306&c=30
I'm the guy to the far left with the OD boonie. If you want to get one of those jackets, ARMYISSUE is where you need to go.