Vintage Y2K Mexx black dress pants.Size US8 but fits more like a6

Vintage Y2K Mexx dress pants in rich black (photos do not do the colour justice) have a clean front and back- no pockets etc. In very condition. 12 1/2” rise. 46% polyester 46% Viscose, 8% elastane Wash inside out in warm water with like colours, I recommend hang to dry Size US8 but fits more like a 6- see photos for measurements