The red dress with open shoulders combines long sleeves with an upper edge running across below the shoulders. A visible leg opening and hanging side fabric add further lines. That combination is useful for winter planning: long sleeves do not mean covered shoulders in this case. If you like the neckline for the indoor event, choose the outer layer around that actual area rather than sleeve length alone. Treat a wrap as part of the reception outfit only if you intend to keep wearing it there.
The long side panel adds another consideration at the coat hem. When putting a coat on, look at which fabric remains visible below it; when taking it off, notice whether the panel changes position. Plan somewhere to put a wrap after removal too. The reflective surface already makes a noticeable accent, so a quieter bag may help you keep the upper outline in view. This is a comparison for open shoulders and hanging details, rather than evidence of winter fabric. Choose shoes and hem together on the actual dress, especially if another pair is intended for travelling.