Then you wouldn't be hunting in Washington, on the wet side. Rain starts around the middle of September and ends in June.Other months we only get drizzle.
I too have often wondered about water proofing PC gear. forty degrees and raining sideways makes modern materials look good.
If I was hunting in WA (I assume the west side as the east side where my wife grew up resembles southern Iraq with a few trees...), I guess I would either get wet, go modern or stay home.
People hunted in WA long before Gore-Tex.
We do have some mighty rains here in the People's Republic of NY, but waterproofing PC gear is a modern solution to a modern problem.
The adage, "When it's hot we sweat, when it rains we get wet" applies.
Wearing your clothing as they did minimizes the issue. Layers, wool, etc all work together and most importantly, they BREATHE.
It all depends on what YOU are doing. Are you doing things the way they did or are you just hunting with old guns wearing funny clothes?
Mario