The official announcement is that he will wear white tie with the ermine cloak. That leaves two other moments on that day to wear a uniform:
1 for the ceremony in the palace and announcement on the balcony 2 for the boattrip and dinner. The latter would require him to wear the eveninggala dress of his naval uniform and that could be good news as it would indicate a white tie dinner and tiara's for the women.
--Previous Message-- : The Stuart Parure seems unlikely to me: on the : eve of the Inauguration Princess Máxima is : no Queen yet and is this parure not : exclusively for the Queen? : : I think the King will wear an uniform seeing : the news about the distinctives. In my : hometown Eindhoven is George Pisa & : Sons, Tailleurs. This company has made the : ceremonial tenues for the Prince. For the : Investiture 700-1000 new uniforms are : ordered, including one for the King. : : Last Prinsjesdag the King appeared in a : ceremonial tenue of the Guards Regiment : Grenadiers, also made by this company. See : the item from Studio 040, the local news in : Eindhoven. : :