Hi Ladies!I need help! I'm addressing the invitations to our wedding and I have quite a few single guests. Etiquette says that it is improper to address the outer envelope as "Miss Jane Doe and Guest"... BUT I don't have inner envelopes! It was going to double my postage costs and I didn't care about them... until now!Can I address the outer envelope as "Miss Jane Doe and Guest" or do you think that it's too informal? If I can't... what are my options to let singletons know that they may bring a guest?Thank you for your help!