Vintage Maxi Black Slip Dress

I don’t even know how to describe this material, it’s so comfy!!! It’s almost like an athletic material? But it’s not. Very soft and breathable. This is vintage dress barn, and unfortunately the tag has been cut off, but it fits like a size L or XL for a tighter fit. I took a picture of the blemish on the back that looks light finger prints? But it’s not very noticeable and looks like it would wash right out. I truthfully bought this as a vintage set, I’ve kept the top that went over it, and so I’ve never worn the dress as it is too big for me. I feel pretty confident that little spot would wash right out, and the dress I find quite flattering to wear just as a slip. Also pictured, it does have side slits! Open to reasonable offers! Bundle to save!