This is a beautiful dress. The sleeve design is unique - sheer, interesting, but giving some coverage for those of us who need it. It is slightly more fitted than most dresses of this type from Vijiv.  Usually, I would order  a size Large. I heeded the advice in other reviews, and bought an XL. It fits perfectly, so I would say to order up one size from the one you usually wear. If you are large busted, two sizes might be best. The dress is not a costume, but if I get the chance to go out on Halloween, "Gatsby", here I come! The dress is a great value, pretty, sophisticated, and yes, sexy, without being obvious or immodest. If you have a place in your wardrobe for "gorgeous", buy it. You won't be sorry!