It's a plain DB peacoat with angled hand pockets and cuff 'buckles'/adjusters (what's the proper name for those?). You can find that all over the place, and the lack of other details is going to make it almost guaranteed impossible for anyone to ID this one specifically. But it does appear to have a functional lapel buttonhole and button, meaning you can button it all the way up to the neck, and this sets it apart somewhat.
I know Marc Jacobs and Marc by Marc Jacobs have both made plain peacoats like that in the last two winter seasons, either pure wool or blended with cashmere, priced around $700-1100. I expect most all-purpose clothiers would offer something similar (though with slight variations on pocket style and may not button up to the neck), so try Brooks Brothers etc if that's more your style or price range.
