After some research, I have decided that full skirts with petticoats underneath, and then bodices with blouses underneath will be accurate enough. Here is the first bodice I made - to fit myself. This is the front view,
and here is the back. I managed to get one of those eyelet tools, and am quite pleased with the way they've turned out.
Here are Becky's bodice complete with tailor's tacks (I never thought I'd be glad to know how to do those when we did them at school!), Jackie's top waiting to be sorted out and Sally's bodice cut out and ready to go.
Nicky's bodice has to be able to be ripped open at the back on stage, to reveal the scars she received when she was flogged. Any ideas how to achieve that?