Well spotted Nellie. It could be part of the stomacher.
I notice that the Duchess of Teck is wearing her mother's large pearl brooch with the pearl drop, so this photo is obviously taken after the latter's death.
Yesterday I applied for the Duchess of Cambridge's will. According to the National Archives UK's website, wills from that period can take up to 10 working days to digitise. It will be interesting to see what is in it.
I believe that the Duchess of Teck died intestate, so I ruled out her will as an avenue of research.
--Previous Message-- : : Perhaps the stomacher is worn here by : Princess Mary Adelaide, Duchess of Teck. : : :