Check out Vaute Couture. It's a tiny venture that's in its second season. The designer behind it, Leanne, is ridiculously nice, and she's totally devoted to cruelty-free, super eco-friendly, stylish, warm vegan winterwear. (And this year she has men's coats!!)
Right now, you can preorder her Fall/Winter 2010 lineup at huge discounts -- She does this so she can fund the production run. I just ordered today 9/14 and the discount is at 45%, but it goes to 35% Wednesday. (Each week the prices will get closer and closer to full price.) The orders will ship in mid-October, I believe.
Here's the link to the coat collection: https://www.vautecouture.com/c-2-coats.aspx
Here's the link to her blog, which has all the details on the pre-order sale: http://onoursleeve.com/
Here's a link to a video about Leanne/Vaute Couture by The Discerning Brute: http://vimeo.com/9510473
I'm super excited about my slim vegan Pea coat. I never thought I'd be able to find one, considering the rather ugly state of men's vegan coats, but it seems like Leanne is changing things.