Spense strapless sundress

Black and white colored convertible/strapless sundress. Can be worn with straps, but straps are missing. Buttons are present in the front and back for straps. Zips on side. Shell: 95% cotton, 5% spandex; Lining: 65% polyester, 35% cotton; Combo: 55% linen, 45% cotton. There is a small rust colored stain on the upper left side in the back of this dress. I have not tried to have it professionally removed. For reasons of missing straps and stain, negotiable price.