So I was going predator hunting with a buddy and was in a bind for some 'whites'.
I ran down to Wal-Mart (it was late and nothing else was open), got a white sweatshirt to put over my coat and a pair of white dickies painter pants to put over my snowpants.
Dreading my time the next day in less than ideal gear and being wet ALL day, I went back to the camping section and found a can of Atsko Silicon Water-Guard spray. For $5 I thought what the heck
Hung the pants and sweatshirt up in the garage and used the entire can on 'em. I let dry for a couple hours and since the tag says 24 hours or something like that and we were leaving in the morning, I threw 'em in the dryer to help out a bit .
50 miles on the sled through some good powder, trudging through and sitting in snow for 4-5 sets, I was amazed to see the water beading up on cotton pants and shirt. It would bead up and freeze without soaking in. I'm tellin' ya for 5 bucks, give it a shot.
I'm re-waterproofing my snowpants since I've had since 8th grade and maybe I'll get another season out of 'em since I ALWAYS come home wet when I wear those buggers...