The other particularity of this piece is obviously its shawl collar. It is continuous, rounded, without notch and wraps the neck well.
In the 19th century, clothes with a round neck were more likely to be indoor clothes. It also has its origins in the Victorian jacket which was the first to have one. Men would put this jacket on over their tuxedo before going to smoke to avoid spreading the smell of cigarettes on their evening attire.
Later, this collar was adapted to the peacoats of dockers who found it both practical and warm to protect themselves from the wind.