There is a fabric made from lotus (the bast fibers in the stem) that is supposed to be naturally waterproof. You can find it at samatoa.lotus-flower-fabric.com. [youtube]https://www.youtube.com/channel/UC7cSyFmGpE0e9-iFrw1TP2Q[/youtube]
The only reason I have not bought any yet (I have sensitive skin, and am in the process of eliminating everything synthetic that touches my skin) is that it costs over $200.00 per yard. So I am saving for this purchase. I live in Seattle, so the waterproof part is more important to me than warmth.
