Open-Back Dress

How low an open back can go is set by the fastening rather than by the design. A zip has to start somewhere, and that point is the floor of the opening, which is why so many backs stop at the same height. A dress that opens lower than the zip allows is using a side fastening or a tie instead, and that is the detail to look for if you want a genuinely low back. The listed style name will not tell you; the closure description will.