Oh no!
I guess I would try to cut out the exact same back panel, and replace at the seams.
I was just thinking the same idea for the skirt.
I'm pretty sure that chiffon skirts always have a layer of crepe or satin underneath.
LOVE the idea of a satin bias ribbon.
I don't really know what I'm talking about, but it's kind of cool to read along and see what I wanted to say already written by the time I got to the end of the thread.
I've only made Ren Faire dresses out of cotton.