This was, in fact, a Canadian military jacket (sometimes recognized as such by veterans and government officials, in various places around the world) that I had a tailor modify in Vientiane (to make it slimmer). The original cut of the cloth was very bulky, to be worn over a harness or other (military) equipment. The material was ("bullet-proof") aramid (Nomex 3 aramid fiber, as I recall).
I was wearing this jacket on the day of my legal marriage (shown in the pictures above) and on the day when my wife and I were separated (legally, we still aren't divorced!).
