I noticed the two buttons on the cuffs as per here
There were a few photos of it in another thread here some time ago I remember. It looked very much like a vintage jacket to me, if anything it really seemed it ought to have looked a little less 'vintage' in the film, given it would only be a couple of years old.
Liked the wool jacket he wore in there too.
Brendan Gleeson looks more like the real Frank Sheeran.IMO He's the wrong man for this part...…..