Thanks Andy, I've not heard that word - Kagoul - for about thirty years.
You've brought back happy childhood memories of school field trips, and bright Orange 'Kagouls' that if you were skilled enough could be folded inside out into the large front pocket to carry around like a small pillow.
You were the hero of all your school chums if your parents had splashed out on an expensive one, and inside the pocket was an elastic belt that allowed you to carry the packed up kagoul around attached to your waist.
Ahh, happy memories.
Sorry can be absolutely no help at all with where to buy them.
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club