This is a gorgeous vintage 1960's or 70's mod dress by St. John.  An off white 100% wool knit. Cute cut out neckline. Back zipper with pearl buttons at the back of the neck.  Very nice. 

Size M.  bust 38 inches, waist 32 inches, hips 41-42 inches.  shoulder to hem 37 inches.  

Please contact me if you have questions.