I use to snowmobile In Longjohns + sweat pants + Jeans. Jeans got a bit wet here and there but worked fantastic and most importantly I looked cool =D
Looking cool is important!

Of course there is always the chance that your wet jeans and sweats will leave you way too cool, forever.

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"Toto, I've a feeling we're not in Kansas any more."
-Dorothy, in The Wizard of Oz