60s black mini dress, size medium

Black mini dress! Giving a 60s vibe. I think it would best fit a M, but please see measurements below for most accurate sizing! Good vintage with light general wear. One missing decorative bead and couple tiny pin-size holes (see first two pictures). The material feels like polyester. Has some stretch. Measurements taken while garment laying flat Length from Top: ~33“ Armpit to Armpit: ~19“ Waist: ~17” Hips: ~20“ Shoulder to Shoulder: ~16“