The fabric is a polyester suiting that's a medium weight with a satin side and a matted side. Of course, I ordered it online from Fabric Mart.
Honestly, I do not know if this is what one calls crepe-back satin. If you know, please leave me a message. I used the matted side/not satin side. This is one of my favorite fabrics because it's thick enough that a slip is not needed.
This is the last of the three skirts that were made by this pattern for a family member. It has been completed for over a month.