We ordered this with custom measurements. The website said it automatically added extra length for heel height, but that didn't work out for us. As soon as she put on her heels, the hem wasn't floor length. (She is 5'8") I suggest you add your heel height to your hollow-to-hem measurement. Also, beware the sequins catching on each other. You'll have to gently untangle them. They also are scratchy in the armpit.
Overall, I was pleased with our selection, and the dress was a huge hit!