Creating a 1 Piece Fabric Head

[MuppetLabsBoy]

Hello,

I have always made my puppets by carving them (head), and then cutting it in half and then put the mouth plate in btwn them, and then covering the top and the bottom w/fabric separately. I am interested in creating a one piece skull and then covering it with a fabric slip cover like this.

http://2.bp.blogspot.com/-M-idGzIqgiE/TYdO5v5eskI/AAAAAAAAASo/dJy3L1U7rjU/s1600/P3200070.JPG

http://1.bp.blogspot.com/-HWxBx1Yyjd4/TYdNe4awaKI/AAAAAAAAASg/Z12NOtGdne8/s1600/P3200072.JPG

How would I go about creating the skull and covering it in one piece?
Thanks,
MLB

 

[TML]

The fleece is two pieces sewn with a dart at the top and a seam down the center. In that pic, the dart is not yet sewn.