I was so excited about this project that I immediately dashed off a “muslin.” Which is not muslin at all, but a wool/poly blend in olive green. I made a real skirt because the pattern seemed basic enough not to need a real muslin, and the fabric I chose can be ripped and re-sewn without too much damage. But if I were doing this the correct way, a real muslin would be sewn, then cut apart on the seam lines to be made into pattern pieces.
My skirt is still waiting for a hem, but I think it will make a cute outfit with brown boots, an ivory top, and a big brown belt. The skirt below is a placeholder, of course. Mine is still on my dressmaker's form.