When I was taking pictures of the Babyland Rag pattern tester dolls, I needed a way to prop dolls up in a sitting position without seeing the support behind them. I thought of using corner braces, which can be had for pennies. And it worked very well!
Next time I would wrap them in decorative tape of some kind to be sure the corners don't damage the dolls (they didn't). This is what it looks like from the back:
|doll by J. Ann Firth
You could put the angle iron underneath the dress and beneath the doll so the hardware is hidden. It was a simple solution, so I thought I would share it!