Thank you so much!!! The hip armor is made with wonderflex as well. I cut two pieces with curved edges (for each side) heated the wonderflex and meshed the two curved edges together to create the curved "corner" of the hip armor. They look a little bit rough up close, but they tend to photograph really well. If I ever were to remake them, I would probably make the base out of foamie, reinforce it with wire on the backside and shape the wonderflex over the foamie base (which is hoe MOST of the armor pieces are made, minus the wire) but I wasn't sure if it was going to work with the hip pieces, so I just took a chance and free handed it. The hip pieces are held up by two lengths of elastic, one across the front and another across the back, they aren't actually attached to the suit in any way like the rest of the armor pieces.
Hope that helped a little bit!
-Sarah Kate