Hnngggn, I'd love to have more photos of this costume - I loved cosplaying as Creamy Mami, even though the series is fairly unkown here in Germany and hardly anyone recognised it when I wore it at Dokomi.
Ugh, honestly, I don't know. I sewed this costume almost two years ago and I bought the fabric on a market. It was a bit shiny on the right side, smooth and slightly stiff, so my guess is that it's some sturdy kind of silk. I'm sorry, but I'm afraid I can't help you. I'm really not good at telling fabrics apart, let alone name them. I usually decide on fabrics by touching them.