Fibrous != only cotton. Numerous tree barks, coconut husks, vines, hemp fibers, etc., at least one of which can be found globally could be used. One would more

Fibrous != only cotton. Numerous tree barks, coconut husks, vines, hemp fibers, etc., at least one of which can be found globally could be used. One would more likely make a milk or or other natural glue to bind the two halves which was more common.