XXL Gap Navy Blue Spotted Strapless Dress

xxl strapless dress. Navy blue in color with white spots. The back has elastic so it does have stretch to it and around the breast there is a rubberized material so that it stops the dress from falling. The top is also structured to keep the shape. material is very lightweight. top front is lined. bottom is unlined. unsure of the materials as there does not appear to be a tag listed on the dress.