The Bridegroom and Best Man Uniforms

Prince William has chosen to wear the uniform of Colonel of the Irish Guards on his Wedding Day.  Prince William, who is commissioned in all three Armed Services, and who has served actively with the Army (The Household Cavalry Regiment) and with the Royal Air Force (Search and Rescue Force), chose to wear the uniform of his senior honorary appointment in the Army.
Prince Harry will wear the uniform of a Captain of the Household Cavalry (Blues and Royals).

Titles announced for Prince William and Catherine Middleton

The Queen has today been pleased to confer a Dukedom on Prince William of Wales. His titles will be Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus.
Prince William thus becomes His Royal Highness The Duke of  Cambridge and Miss Catherine Middleton on marriage will become Her Royal Highness The Duchess of Cambridge.