A: Why not just take a direct honest approach? Try something like "We know this is a big day for each of our girls. Would you be willing to have your daughter wear a different color dress at our communion party so it's obvious to all the guests, who's communion we are celebrating? I am planning to have my daughter where a blue (or whatever color you choose) dress to your daughter's event. This way, each girl will have there own day to feel special."