Auction house Sotheby's expects the dress to sell for up to $300,000 (£220,000) when it goes under the hammer on 9 December.
Tens of thousands of people lined the streets to pay their respects after 13 days of national mourning.
President Donald Trump said he was not a fan of the couple and added that they treated the Royal Family with "great disrespect".
Norway's new King takes the first major step of his reign as his father, the late King Harald V, lies in state at the Royal Palace.
Mourners gather outside the palace as royals, politicians and citizens remember a beloved king, whose son has adopted the family motto "all for norway".
They will not be working royals when they come back. So what could they be doing instead?
This would be Meghan's first significant acting role since her marriage to Prince Harry.
The Prince of Wales remains in no mood to forgive and forget. The hurt he feels lingers.
Harry and Meghan enjoyed some showbusiness success, but their Hollywood reign proved short-lived.
