This Robert Sheehan photo contains
well dressed person, suit, pants suit, and pantsuit.
There might also be
outerwear, overclothes, bathrobe, and box coat.
I don't know how much he is in the movie but I'd still go just to see him. For the trailer he's in it at 1.30 - 1.33, it's not much but I freaked when I recognized him!