Rare Vintage trench coat size 12

Rare Gem! This work of art is a Glen Laine by Bainton swuede trench coat from "The Old Mill" of Blyth Ontario. It's at least a y2k piece, but could go even be 80s, I'm not certain of the age. Some wear and tear shown on a shoulder of the coat and in the sleaves, but isn't readily noticeable in person. Flat measurements: Pit to pit: 18 1/2" Pit to wrist: 15"