Think in terms of plastic-like which most waterproof stuff is, at least to an extent. However that also cuts the wind, just encourages sweat. However just plain warm doesn't necessarily turn water.

Another thing you can do, really cheap, is go to places like Goodwill and look for cashmere and merino wool pullovers. They won't itch and can be pulled over your Ts. I go look every year and abuse them terribly all winter. That's why I have to go every year. But they make great winter jerseys with a layer underneath or on top. They will even keep you pretty warm if you get wet.

I still like your new jacket.