I made my Werewolf costume mostly by molding a form to my head in plaster. From there I made the lower jaw in a separate part that followed my chin. Important for the ability to chew.
Eyebrows, claws and teeth are made from clay. The fur is sewn from the inside of a shirt and jeans so that it would look cool from the rips and tears in the fabric. I also glued fur on the head and then painted it in werewolf color.
The chains (Werewolf often tend to be chained to walls) are bought at Buttericks costume shop.