However, if I was in the market for a coat, I would probably go to Bluefly. Classic outwear fashion doesn't change all that much from year-to-year and Bluefly has some gorgeous designer coats on sale -- and a select few are vegan.
For a weekend coat (and possibly also to wear over a suit), I would choose this Via Spiga black faux sherling "Francesca" belted jacket (pictured right). The faux leather belt is removable and the collar looks fabulous when "popped." The exterior is 100% polyester, and the interior is 69% acrylic and 31% polyester. Originally $260, Bluefly has it on sale for $131.75 (that's effectively 1/2 price).
As for something to definitely wear over a suit, if I was in a milder winter climate, I would choose this Kenneth Cole Reaction double breasted babydoll coat (pictured left in the black). It also comes in a standstone color. I like that it is water resistant, which means it can double as a raincoat if necessary. The shell is 53% cotton, 42% polyester and 5% nylon, and the lining: 100% polyester. Originally $200, Bluefly has it on sale for $101.15 (again, effectively 1/2 price).
And, finally, for something heavyweight to wear over a suit, I would choose this Via Spiga black "Cristina" double breasted trenchcoat (pictured right). I think it's awesome that it's lined in python printed sateen. I also like the faux patent trim. At 42.5", it likely hits just at the knees. In addition to the faux patent trim, it is made from cotton and polyester. Originally $275, Bluefly has it on sale for $140.25 (again, 1/2 price).
I also enjoy this Marc New York black sateen belted puff trench. For something funky, but possibly not work appropriate except in the tundra, I like this Via Spiga espresso faux shearling "Guzzo" hooded jacket. If you search Bluefly, you'll find that the Via Spiga hooded jacket also comes in a shorter version.