So, I happened across this on eBay. Available by the yard for $16.99, it's gold organza with self embroidery.
"You are bidding on one yard of a beautiful gold organza with self embroidery Fabric is 104 inches wide and is great for you, your dolls or any Holiday projects. I have used this for curtains, and Civil War Reproduction ball gowns.It is a beautiful fabric. There is more uncut yardage in my Ebay store, Memaw's Attic."
I think it would be a fantastic shortcut for the Emerald City dress. For the skirt, just use it as a few of the top layers. (See below)
And for the (UK-whatever-AU) bodice, use it as the interfacing over the already constructed bodice. (I genuinely hope I'm making sense here, because I'm all drugged up and a little confusable)
Clearly, it's not as perfect a match as the skirt, but anyway, I thought it might be helpful.
You can purchase the fabric here.