Vintage YSL Saint Laurent intimates nightgown

This is a really neat vintage cotton lawn fabric gown/lounge dress by Yves Saint Laurent Lingerie. Very unique neckline. Maybe the original cold shoulder?! Ties in two places on both sides. One is decorative the other is adjustable. Ties are tiny and delicate. There is a 11.5 inch slit on left side for easier movement. Aprox measurements are: 42 in from underarm to underarm. 42 inch across all the way down dress 10 inch from shoulder tie to end of sleeve. 37.5 inch from back neckline to hem.