Do a web search for clothing made from Double Layered Ventile.
If you want the very best, fully natural, fully waterproof clothing, then Double layered Ventile is the way to go.
Unfortunately it not cheap, but its very long lasting, and in its double layered form, is almost bulletproof when keeping you dry.
As Ventile is the top 10% of the finest Egyptian Cotton, its very breathable, and when any moisture comes into contact with the cotton, its weave is so fine, that water molucues cannot pass through, yet it will allow sweat perspiration through.
Its only downside, is that its very expensive to manufacture, and when the fabric gets wet, it does increase its weight considerably, but there are few fabrics that come anywhere near it for keeping the elements at bay, and that's why its still the choice of Polar expeditions.