The role of Rishon LeZion, otherwise known as the Sephardic Chief Rabbi of Israel, seems to include wearing a traditional robe and turban. Related to this question, this outfit is distinct from the typical black-and-white clothing/black-hat attire that many contemporary Israeli Sephardic rabbis assume. Where did this custom come from? The distinctive flowery design sewn on the robe seems to have started with R. Ovadia Yosef, as I have not seen any picture of an earlier Sephardic chief rabbi with that design, but it has been continued to this day.
Is there any significance to the design? How and why did it become the Rishon LeZion's official outfit? Is there any documentation on this outfit?