July 8, 2018 - Source: Dominic Lipinski/Getty Images Europe
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17. They Can't Wear Tiaras
Have you noticed that you have never seen a young royal wear a tiara? The white tie staple is only worn by married women, and is traditionally worn for the first time by brides.

The reasoning for this was to nix any social awkwardness at receptions. Men would be able to easily spot which women were taken, and wouldn't make any embarrassing advances their way. So you won't be seeing Princess Charlotte wear a crown anytime soon!