When it's really cold outside, I wear my black down filled "Failford" Burberry coat. Best buy ever. It's not my usual style, but it's so functional and I do love it. It's so flattering too for such a warm coat, because it can be belted at the waist, so you don't look like a puffy marshmallow haha (and it has a hood for when it snows)! I wish it came in chocolate brown too!
i have a really awesome coach coat- down with fur trimmed hood. it hits at the top of the thigh and has these silver hood button type things. i LOVE it, its so warm and thick, yet so sleek and form flattering.