Bill Levkoff gown, cranberry color, size 4

So pretty, great cranberry color, sweetheart neckline under sheer fabric. Bodice has built in boning. There is no sizing tag so please follow measurements below and be your own judge as to sizing. I think this may be a size 4 but again that is only my opinion please follow measurements. Measures 15 inches across when laying flat from armpit to armpit. Waist measures 13 inches across when laying flat Lengthy measures 49 inches from armpit to hem