i have a few old books about trapping and canoeing and of course wool was the only thing they had,a old suit jacket that went "shabby" was a good choice among campers and fly fisherman.i did not see much in the way of rain gear.top and bottom rain suits seem unknown and waxed overcoats were heavy and expensive.
so to the point,with fleece or poly fluff of some sort and modern rain gear you have all the good points of wool beat by a mile.warm,dry and light rather than wet and heavy.when you have wool on and it's keeping you warm when it's wet you are burning up lots of calories to do that.energy best used for what you are out in the weather doing.