Sewing Bat wings

So I'm working on a Bat bodysuit for someone and I'm getting to the point where I need to sew the wings. However I'm not sure how to go about this part. I'm using a fleece type material for the membranes and its going to be attached along the body and connect with the hand so it all one piece in the end. Plus a couple extra bits between then fingers which are extended out and extra 10 inches or so from the end of the hand.

Guess I'm just wondering if anyone has ny advice on how to proceed here.