This took a while to get sorted out, and I'm still unhappy with the results of the dress.
The hair is made of stripped wires attached to the head, covered by thin layers of paper to flesh it out. That gives the hair a flexible support that can be changed if needed.
Here's an image of the internal structures that allow the figure to move. Each limb is composed of the same amount of pieces and hinged components. More developments as they come.