This will vary a bit depending on whether parents are issuing the invitation or whether the couple are doing so but in general this style is acceptable:
One of the most innovative and bold of the Anna Griffin wedding invitation designs, though, is the button pocket invitation style. The Black and White Floral Button Pocket Invitation is part of the Anna Griffin printable wedding invitation collection. Each wedding invitation set includes an ecru invitation panel with a beveled border, a button pocket with a diagonal slash design and matching envelopes. Other printable wedding invitations in the Anna Griffin line include floral vellum side panels, buttons and ribbons. In a very short time, designer Anna Griffin has made a name for herself as a graphic designer who can combine romance and whimsy, throw in a touch of elegance and create wedding invitations that are unique and memorable.