I have used Hellebore's arm here. (Note that the third and fourth fingers are joined.)

• Using a sharp 2B pencil, draw or trace the arm onto the wrong side of doubled fabric leaving an opening to turn through.Using a small machine stitch (size 2 on most machines) and matching thread, sew carefully along your pencil line. Stitch a tiny curve between the fingers rather than a point. Be sure to back stitch at each side of the opening.Carefully cut out the arm leaving about a 3mm (1/8in) seam all around. (You may wish to leave a slightly wider seam if the fabric you are using is prone to fraying.)Using a small finger turning tool, (see accessories), turn each finger then the whole the arm right side out through the opening.(See below for instructions on how to use the turning tool.) Lay out 4 x 15cm (6in) pipecleaners, one for each finger and one for the joined fingers.Place a very small blob of glue on both ends of each to stop the sharp wire ends from catching on a thread or poking through the fabric. Allow to dry. Fold back about 25mm (1in) on one end of each and line them up to correspond to each finger. Use the last one to twist around the others and hold them together. Feed these through the opening up into the hand, folded ends first. Ease each pipecleaner into its corresponding finger. (It's a bit like putting gloves on a toddler.)When in place, top stitch between the third and fourth fingers, tying off the threads at each end or back stitching.Place a little stuffing up into the back and front of the hand ( you do not need to put any stuffing into the fingers) and continue to stuff the arm until it is a good firm shape. Close the opening using slip stitch.
• Repeat for the other arm. Remember to pose a left and a right hand.

How to use the turning tool.

To turn through a finger or small limb, place the straw inside the piece to be turned. Push it as close as possible to the end without forcing it. Position one end of the rod on the outside so it is lined up with the end of the straw on the inside. Gently roll the finger over the rod. Repeat for all the fingers and turn the arm through. See diagram.