A purple puff-sleeve dress has a short lower section, an open shoulder line and large rounded sleeve details. Folds run diagonally through the middle. The wearer rests the hands behind the body, so the front silhouette is visible but the back is not. The reflective-looking colour area cannot prove fibre, and the pose cannot demonstrate a particular rear opening. This reference is most useful for comparing strong shoulder volume with the quieter narrow-strap examples.
Try a similar shoulder arrangement while greeting someone and putting on your outer layer. Notice whether a sleeve needs reshaping afterwards and whether your preferred earrings or loose hair touch it. Then sit to check the short skirt and the diagonal folds in a natural position. Keep a relatively simple bag for the first comparison so the shoulder idea stays clear. If you are considering an open-back version, obtain a matching rear view rather than assuming one behind the hands. The front detail can guide a useful choice while the actual closure, coverage and care remain separate product questions.