I've made this from soft stretchy cotton denim.
I fitted the skirt by basting the panels together, putting it on inside out and then repinning the seams and curves for a better fit.
I ruched the bodice as the demin stretched during construction - this pulled the nackline back in nicely. Next time I would interface or staystitch the bodice. You live and learn!
More on my blog SewBusyLizzy