How about something like this?
http://www.llbean.com/llb/shop/64946...ed-ridge-parka

I'm pretty sure this is my coat and it goes up to 3x
http://www.eddiebauer.com/catalog/pr...mPathInfo=null

And this one comes in 3x, rated to -20
http://www.landsend.com/products/wom...a/id_243928_57

Or this one rated to -35
http://www.landsend.com/products/wom...a/id_243931_57

This is a Columbia jacket in 3x
http://www.sierratradingpost.com/col...colorFamily=02
You could also try Junonia as well.

I'm a fan of Lands End. I like "parka" style coats which means they go down below your butt. I have two Lands End coats.

And straight up, you will seriously increase the warmth of your coat it you wear a good scarf. It not only keeps your neck warm, but keeps warm air from chimneying out at your neck.

The other day I went to NYC so I knew I would be walking around outside. So I layered up LOL. long johns, jeans, timberland boots (which I Love) turtleneck , sweater, and I had one of those fleece jackets that look like the north face one except I got mine at Walmart and then I put on the coat that I was talking about in the original post.. I WAS WARM AND TOASTY.
It's all about the layers. It was cold that day I think it was 18°.

Thank for all the post. I like the Lands End Squall Parker in the link above. May keep that in mind.