When I was overseas last month, I actually made it to the National Museum 35 minutes before closing.
It was just enough time to see the "Royal Journeys" exhibit, which was a gift from the government to the King and Queen for their 75th birthdays. The display included the royal carriage, photographs, medals, lots of kingly uniforms, and of course, the part I cared most about, gowns.
The Scandinavian style tends to be austere and not heavily ornamented, but the gown below belonged to Queen Maud, who was a British princess before she married. This is her coronation gown from 1906.
There was also an exhibit of suitcases- all the stuff the Queen brought with her when she came to the country a hundred years ago! That was just as much fun to see.