Dutch State Visit to Brunei: January 21-22, 2013

[Humera]

Only Queen Saleha wears tiaras at state dinners. The rest of the ladies of the BRF don't wear them, which is a shame of course because they have some spectacular jewels.

 

[Hakimi]

The Sultana did wear a tiara on the first day,for the return ...dunno..
Dress codes are always known in advance so it maybe is a personal choice

It's a personal choice.