You can see that it fits better at the waist and the bust. There's only minor pulling in odd poses but way less excess fabric and the waistline seam lies down better as well. In the pic below it rises up a little and can give me a tiny bit of tummy depending on the angle.
It's a good bit shorter and the back is lower which makes it nice and airy.
So does the fashion fabric. It is lighter than the quilting cotton which is perfect in the current heatwave but more prone to being caught by the wind. The quilting cotton yields more body to the skirt and feels more substantial - without being heavy or stiff, though. Both the quilting cotton and the fashion fabric work well for the dress design and I enjoy wearing both of them equally. Well, yes, okay, I'll admit that I love wearing the new one a smidgen better but only because of the still improved fit and, let's face it, it's shiny and new!
I'm sure I will revisit the pattern but now I've got to take the plunge and try something else.