"Meghan looks stunning in the red Self Portrait dress," fashion expert Donny Galella told New Idea.
"I love the belted detail and lazer cut detail on the chest."
Harry and Meghan will have a private audience with His Majesty King Tupou VI and Queen Nanasipau’u before the reception and dinner
School children have been given the day off to welcome the Sussexes to Tonga.
Youngsters lined the route between Fua’amotu airport and Nuku’alofa, waving at the motorcade as it passes.