Blue express strapless dress

Gorgeous fitted blue Express strapless dress with ribbon bow detail, back hidden zipper. Boning and tailored top. Tag says size 6 I am listing as size 4 as I am a size 4 and it fit. please see measurements. Approximate measurements laying flat armpit to armpit unstretched 15in, waist 14", length,33 in. Dress does have alot of stretch. Rayon, nylon, lycra, spandex. If you pale spots that are barely noticeable, tried to take photos. Other than that excellent condition worn once to a wedding.