I have an ANSI Parka from Alertshirt.com. http://alertshirt.com/class3parka.html

It's lined with quilted sateen sort of material - it's been in the upper 20s, and I've been wearing a polarfleece thermal underwear shirt under it, and then use the snaps instead of the zipper, which gives me some ventilation so I don't get too muggy. It's thigh length, which is nice when I'm wearing jeans and it starts raining, it protects the upper part of my pants. There's a hood that stows in the collar of the jacket.