A pink draped long dress has a broad falling neckline, short fuller shoulder details and a gathered-looking waist area. The skirt opens over one leg, and a hand holds part of the fabric. Material extending onto the floor adds another lower area beside the visible shoe. The photograph is useful for the relationship between upper folds and the opening, without supplying your own preferred coverage or hem measurement.
Try a comparable dress with your arms relaxed and hands free. Walk at your usual pace, sit and stand before arranging the skirt. Look at the opening from the side and decide what you want it to show. If you would prefer another height or shape, ask about that exact change on the actual garment.
Next add the bag in its carrying position so that a hand is no longer automatically available to guide fabric. Compare how the short shoulder details sit under your outer layer. A softer-looking arrangement above and a dramatic opening below can work together when you enjoy their ordinary use, rather than only the held photographic pose.