This is a custom design of 5.5x7.5" invite and 3.5x5" RSVP card (example shown is not to scale - it needed to fit in the Gallery).
The language is formal.
You can also choose to have the card background be the flower pattern shown in this example.
Final art to be provided in JPG or PSD (PSD would have placed art in one layer and the background in another layer to allow a printer to apply bleed). AI/EPS source files are available for further editing.