a uniquely patterned skirt by Pendleton. 
not only is the color unusual for a plaid (indigo, or halfway between royal blue and royal purple),
but it also has a paisley pattern subtly woven into the fabric.
i couldn't find a single other one like this online, though there are some red/green paisley/plaid combo pieces out there. 
outer layer is a faux wrap front, but underlayer is a black pencil skirt, without a slit. i think it's probably acetate, for the lining.
closes in back with a button/zip fly.

has been hemmed shorter (hand sewn). 
they did a pretty good job. 
otherwise great condition with only minimal signs of wear. 

MEASUREMENTS: 
No stretch.
32" waist.
45" hips.
28" long (just below the knees for most people).
labeled US size 16, but it fits more like a modern size 12, so a large.