When Prince William went out to celebrate St. Patrick’s Day yesterday, he paid a beautiful homage to his brother Prince Harry.

The Duke and Duchess of Cambridge were at Aldershot, 40 miles southwest of London, for a St. Patrick’s Day march.

Prince William was also seen wearing his Irish Guards Colonel outfit, which has a fascinating history.

Experts have remarked that the Duke’s St Patrick’s Day outfit resembles the one he wore during brighter times with Prince Harry.

The Duke wore the stunning red uniform of an Irish Guards officer when Kate and William married in 2011, in sharp contrast to the black Royals and Blues outfits worn during Harry’s wedding years later.

The uniforms of Harry’s wedding and William’s Irish Guards are very similar.