This is a vintage 60s/70s black calico prairie style skirt by Gunnies for Gunne Sax by Jessica McClintock. The skirt is lower calf length, depending on your height, and has corset yoke front made with open cotton lace, is trimmed with white ribbon and lace to define the yoke, has a back zipper, and has ribbon and wide lace to define the lower ruffle.
They are in good condition with minor wear and no other problems to note.