Hi, thanks for your question! It's 28 & 1/2" measuring from the part of the halter strap that would probably hit at the shoulder level to the hem. It could be a little longer or shorter depending on how you tie the strap behind your neck.
Hi, The waist measures 22" unstretched and will stretch to about 32" max. There is no zipper. The third pic above shows the back. I think there is a little elastic around the top of the back, but the whole dress is soooo stretchy, it's hard to tell.