Supermarine Rain Shirt
The secret to this water-resistant shirt is in it’s history. The Supermarine Cotton ($300) is a WII fabric with a 21st Century twist. It’s origin is simply an updated version of the fabric Ventile, invented by the British during the war.
Here is a snippet from their site explaining a little more about the shirt.
A fine pivot sleeve shirt, woven with the longest Egyptian cotton fibres available yet water resistant enough to protect you for hours in the rain. Our Supermarine cotton is beautiful to touch but with a dense weave that gives it a rugged worksman-like drape. Super breathable, highly water resistant and made of 100% cotton. Fit’s a size small, recommended to size up.