An open-back jumpsuit is shown from a rear side angle in this reference. The black upper section leaves much of the back uncovered, while the waist leads into close upper trousers and wider lower legs. A small bag is held at the side. The pose helps show the back outline but does not reveal the front neckline, internal support or how the garment opens.
Try your intended underwear with an actual model and compare the side while leaning forward as well as the back when seated. Add the jacket or wrap you expect to use. Decide whether you enjoy the change between covered arrival and uncovered back indoors. You can make that preference without assuming the garment includes built-in support or a particular fastening.
For handling, ask where the opening begins before attempting to lower the outfit. An open back does not guarantee an easy bathroom sequence. Practise the actual steps carefully and keep the upper section clear of the floor. Record that result beside your coverage preference so the attractive back view remains one part of a usable one-piece choice.