If you look back at pictures of Catherine, the Duchess of Cambridge, and the Queen at official events, you'll notice they very often wear coats or coat dresses, especially during autumn and winter.
Even Meghan Markle has adopted this look, as recently as Trooping the Colour, where she and Kate also nodded to their wedding days with their outfits.
They tend to be colourful and match whichever dress they have underneath. You'll probably see them at the same event with their coats on, and later without, however the one thing you'll never see is the royals taking them off - and there's apparently a reason for it, which like many things, comes down to royal fashion etiquette.
According to Australian site Honey, it's because it's 'not ladylike' to take any item of clothing off in public, and that includes coats, regardless of how demure your outfit is underneath.
And Kate is a stickler for the rules, often opting for nude or pale pink nail polish in public (dark polish is a no no), although she does like wearing wedges, even if the Queen isn't a fan.
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