He may be wearing what is sometimes referred to as a "veteran jacket". The way this worked was when a soldier reenlisted after thier original enlistment they recieved a bonus and a furlough. Some soldiers wanted to look good during their furlough so used part of their reenlistment bonus to obtain a private purchash jacket. Some wanted to look 'different' from a normal soldier and opted to wear these nine button jackets which were considered more stylish.
The soldier could have a tailor make him what ever jacket the soldier wanted so there were wide verities in style. This brought up the problem of modern uniform buffs trying to categorize these jackets. I have read an article that summarizes these 'veteran jackets' and one of the common styles was the low collar nine button jacket with veteran stripes on the sleeve cuffs.