St John Evening knit sparkly argyle sheath dress

St John Evening by Marie Gray knit cream and black dress with thin adjustable straps. Sparkly crystal argyle pattern at the meeting of the cream and black. Cream area is embellished with tiny rectangular sequins. Flaw (stain) in centre front, I haven't tried to clean it. Armpit to armpit measures 17 1/2 inches. (the material is stretchy) Waist area measures approximately 16 1/2 inches. Length from centre back to hem is 29 inches. Dress is around knee length