Meghan Markle has been serving fierce nighttime formal fashion on her royal tour of Australia with Prince Harry, but she left one notable accessory at home: her tiara.

While Kate Middleton was across the globe in a sparkling topper from Princess Diana’s jewelry box, Markle went tiara-less this week, despite the fact that she was also attending formal dinners. At first we weren’t sure what caused her to say no to such a unique royal perk — because let’s face it, the opportunity to wear fancy tiaras does not come by often — but it may not have been a choice for Markle in the first place.

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According to News.Au, the Duchess of Sussex has not been permitted to wear a tiara because the state dinners she’s attended have not been proper white tie events. Basically, according to the outlet, a white tie event is the only situation in which a royal family member can wear a tiara. Markle has only attended black tie events since landing abroad.

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White tie events typically include things like formal balls, nighttime weddings, and state dinners, but black tie is ever-so-slightly less formal. The differences in actual outfits at black and white tie events are usually subtle, but you can’t miss the tiaras in the latter.

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For men, white tie typically requires a full suit — including a white bow tie — and formal shoes. For women, the general rules of thumb are less explicit, but princess-like gowns are the typical go-to. 

Fingers crossed that Meghan and Harry get invited to a white tie event soon.

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