Was digging through my loft and found this gem. At first I wasn't sure what it was, but when I saw the buttons I got quite excited. They are Army Service Corps buttons, which in my mind makes this Jacket at least pre 1918 as in that year the ASC became the RASC and changed badges.
but what sort of jacket it this? I'm correct in thinking it is British WW1?
The buttons are brass, have been highly polished and are detachable.
Any help would be appreciated.