My Halloween costume this year. I had been working on an articulated hand and expanded it into the costume.
The arm and palm are plywood, the fingers and thumb pieces are wooden handles from BBQ forks. metal hinges and small eyebolts at each joint. then along the back of each joint is a spring and along the front runs the cord which is tied to a metal ring sewn on the first knuckle of each finger on a glove. some upholstery vinyl as a forearm guard to hold it on.
Worked great, the fingers moved as mine did, oh and metal (tin) along the back of the hand gauntlet style.