I've let my single friends and family know they're entitled a plus one, however I want to write it on the invitation to remind them. I don't have an inner envelope, so it will have to be on the outer envelope. Putting "and Guest" sounds boring and outdated. There has to be a better way to say it! What can I substitute it with? I'm all for a 1920s wording etiquette too as it'll match my invitations.