Understanding Fabric GSM for Quality Control

Decayable Fabrics No.2 - Natural Waterproof People in the past used to make natural waterproof garments before the invention of plastics. I wanted to make a natural waterproof raincoat using materials that are sustainable and breathable. However, during my research, it seems majority of the waterproof fabrics available today are made of plastic. This led me to research on what people historically used stay dry. It was interesting to see that different regions had their own unique methods. In anc