Pencil Skirt Size 4/6 shiny Blue Denim color

Used in fantastic condition! Bought in NYC about 10-14 years ago. Do not remember which store though? High waist pencil skirt with a slit on the back. The size on skirt is 6 but see measurements as it is not a true 6. I wear a 4 and this skirt fit me. Smoke free pet free. Always put this in dry cleaner. When looked at close it’s black, blue, silver thread I believe but from a far denim color.