Bridesmaid dress 20

Ptp 20" Waist 20" Length 36" (pit to hem) Simple bridesmaid dress with some beading and embroidery. It is fully lined and made to be strapless, but thin straps were added (they could be removed). Has the bra clips for strapless and "boning" on the bust for shape. It was ordered as size 20 before alterations. It should fit a 38C or 40B bust without much alteration. There are no tags or labels that I could see, but it was purchased at a reputable bridal shop for $300-$400 approx. 20 yrs ago.