I plan to get hemp or hemp/cotton material from this link below. They also sell hemp webbing that can be used for the kilt straps. You could use a regular buckle or a double Dring friction buckle.

http://www.hemptraders.com/


This site has 12 oz hemp twill fabric and webbing. Depends on the look and feel you want, this wont match wool or PV but could be nice cloth.

http://hempbasics.com/