The Princess of Wales was an icy blue vision at Trooping the Colour in a familiar coat as she arrived at the annual celebrations of The King’s birthday. Her light blue Catherine Walker coat had royal fashion enthusiasts racking their brains for why the style felt so recognizable. The classic silhouette paired with vintage-reminiscent contrast detailing had an incredibly '80s feel to it, which makes sense, since Princess Diana wore an almost identical coat dress from the same designer in 1987.