I have made many wedding invitations and there are several dies that might work as an overlapping gatefold for a 5x7 invitation:
SU So Detailed (I think this one is retired)
Crafters Companion Sophia, Isabel, Chantilly Lace, Splendid Swirls, or Garden Party
Spellbinders Flower Garden
Sizzix Foliage Wrap, Floral Wrap, or Foliage Edges
I made my daughter's gatefold wedding invite using the Crafters Companion Toulouse die.