Being invited to a destination wedding can be a great excuse to take a vacation, as well as having a reunion with family and friends. You'll want to think about this when telling your guests what to wear to your event. Everyone will need to pack their finery for the trip, and if you choose to ask that people dress formally, it may be a hardship on some of your guests to travel with fancy clothing. It's usually better to expect that your guests will wear informal attire, even if you choose to dress traditionally. It will make the trip much more comfortable for everyone involved!