R&K knits black long sleeve maxi dress with silver neckline and cuffs

For sale is a beautiful 1960's Long party R&K knits black maxi dress with a metallic silver detail around bateau neckline and sleeve cuffs, with back zipper and two hooks closure Includes a detachable belt with same metallic silver detail as neckline and cuffs. In a great vintage condition! No marked size, fits size M, please see measurements below for proper fit. Measurements (Flat) Shoulder to shoulder: 16" Armpit to armpit : 19.5" Waist: 38" Overall length: 55" Sleeve length: 23" belt length: 38"