Prince Louis' very sweet tribute we all missed at Trooping the Colour

He may be a Prince, but it turns out Prince Louis is just like any other younger sibling!

Making his official royal debut at Trooping the Colour yesterday, the one-year-old stepped out wearing vintage hand-me-downs.

But these weren't just any old hand-me-downs.

If the white collared shirt with blue embroidery and matching blue shorts look familiar, it's because Prince Harry wore the exact same outfit to one of his first Trooping the Colour celebrations more than three decades ago.

Images from 1986 show an adorable young Harry being held by his aunt Princess Anne who, coincidentally, wore a yellow dress and hat very similar to the yellow Alexander McQueen dress and Philip Treacy headpiece Kate was wearing this year.

While it is unclear who originally purchased this outfit for the Princes, it is possible Princess Diana may have hand-selected the item so it now holds a special place in William and Harry's hearts.

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The tribute to the Duke of Sussex comes four years after Prince George wore the same blue outfit his father, William, had worn at Trooping the Colour in 1984.

It will now be interesting to see if Harry and Meghan Markle follow suit at some point in the future and also don their son, Archie, in the same outfit.

The event marks an official belated birthday celebration for the monarch, who turned 93 in April.

The annual event brings together over 1,400 parading soldiers, 200 horses and 400 musicians to honour Queen Elizabeth II.

The entire royal family all stepped out for the special occasion and reunited at the Buckingham Palace balcony.