This year, however, I have this one from Columbia and I love it!
Don't I look happy and warm? (That's not me.) It does keep me happy and warm though. It has a nice thick Polartec layer on the inside that can zip in and out, making it work as both a winter coat and something of a heavy-duty windbreaker. It hasn't gotten too cold here yet, but so far I've been nothing but toasty. I have it in a light/dark blue & white combo that isn't on the website, and it's cute. The outer layer is waterproof and it has a detachable hood, musts for the Pacific NW. There are also stealth pockets on the inside for being sneaky. I am really happy with this coat and think that I'm finally out of the endless vegan coat search. It is a little pricey, but I think it's worth it to have a high quality coat, and I'm sure it will last me several years at least. Columbia also has a lot of outlet stores, so if you can find one near you, do it, I got this for about half the price.
As for other vegan coats, sportswear brands like Columbia, North Face, etc. are, though pricey, promising. While a lot of their coats do have wool and down, they are designed for being X-TREEM in the winter and thus aren't 100% wool like peacoats, because that doesn't protect you from the spray you get as you schoop down a black diamond ski slope. Or so I would imagine. My home state of Kansas is not notorious for its skiing. Anyway, they like to use manmade materials with names like Opti-Warm and Microtemp to show they are approved by Science.
Here are a few other vegan ones I've found:
the Zurich Parka from Columbia
the High Jump Parka from Columbia
the Bugaboo from Columbia
Boulevard Jacket from North Face
Ava Insulated from Merrell
Amber Road Coat from ModCloth - a friend just got this one and describes it as "not that warm, lighter than I expected", but it's so cute!
The interwebs are your friends. All of them. Stay warm, vegans!