Shapes as green as a verdant meadow spring to life atop layers of wind-blown chiffon. By Tracy Reese. * Slip included * Exposed back zip * Silk; silk lining * Dry clean * 34'L *

Size 4.   It is actually composed of two pieces, a slip and an overdress.  
Underarm to underarm measures 18.5 inches across
Waist measures 14 inches across.