I'm not sure you'd really want to wear what the British Army did. During WW2,and for many years after, motorcyclists wore the DR mac-a HEAVY rubberized canvas overcoat with all sorts of snaps and straps-even leg straps to wrap the "skirts" of the coat around your legs. You'd get some looks wearing it today...
I just got a Barbour International,but I have yet to actually take it out on my new Bullet (rain mixed with snow for two days since delivery)
so, I can't give a review of it-but I always wanted one,and I usually wear other waxed cotton jackets (Filson) for everyday wear. Until it warms up a bit, I'm probably going to wear the wool liner from one of my Filson coats under the Barbour (I didn't get the snap-in liner for it)
It IS black,which is not so good from a visibility standpoint,but I'm going to upgrade my old (black) helmets anyway to something eye-catching (I was out of bike riding for many years until I recently got the itch to ride again).
I got a pair of Belstaff waxed cotton overtrousers on eBay recently for very reasonable money. i don't think they are made anymore, and I'm not sure Barbour still makes them,either.