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A good option for 100% wool outers is Swanndri of NZ. They sell wool treated to be very water resistant.
Here's the catch: your sweat largely stays on the inside too. In my experience you don't feel wet while you're wearing it, though.
Unfortunately they moved production to China some years back. Quality is fine in my opinion but if you look at their older stuff it came in a lot of better colours and patterns and not just shitty buffalo check.