Just in case anyone is still looking for a warm, waterproof, bum covering coat, that isn't hideous, I'm just back from a walk in cold wind, sleet and snow in my Jack Wolfskin Iceguard and I was warm and dry the whole time. Love, love, love my coat!
(and for sizing info, mine is Sm, I'm a size 10, and 5ft2 and it's perfect on the sleeves and sits on my knee)