Kate attended the St. Patrick's Day parade as Colonel of the Irish Guards for the first time.

William wore an Irish Guards uniform for his wedding after being appointed Colonel by the Queen.

William's Irish Guards uniform has the distinctive button arrangement of the Irish Guards.

William paired his uniform with the Order of the Garter sash, the Queen's Golden Jubilee medal, and his Royal Air Force wings.

William did not wear the Irish Guards uniform for his latest appearance.

William's younger brother Harry said he was "gloomy" and "frustrated" about wearing the uniform on his wedding day.

William reportedly asked to wear the cavalry uniform and frock coat of the Royal Guard for his wedding.

The Queen dismissed William's request and insisted that he wore the Irish Guards uniform.

William knew that it was for the best and accepted the Queen's decision.