It seems that Salva Kiir Mayardit, the First Vice President of the Government of National Unity of Sudan and President of the Government of Southern Sudan, likes to wear hats. Even in the Oval Office:
But a while back he took off the headgear, and put on a conservative dark suit, to meet the Chinese.
What gives? After all, he took off the hat for Tony Blair, too:
But he left it on for the UAE, although in that case there was headgear all round: