They say your hardest client is always yourself. For my wedding I designed a set of 5″×7″ invites, 3″×1½” RSVP cards, and 5″×7″ itinerary sheets which were notched to hold the RSVP cards. The invites and RSVP cards were letterpressed, and the itinerary sheet was printed on vellum.
Instead of sending RSVP cards that needed return postage to be sent back I created an online RSVP system. Each of the cards had space for us to write down the unique login and password for the individual receiving the invite.