a man from London who has the right to dress in special black clothes covered with pearl buttons, in order to collect money for charity

Pearly kings and queens were plentiful all over cockney South London. 在伦敦南部的贫民区，珠母纽王和珠母纽后比比皆是。

There were more buttons than you'd find on the back of a pearly king. 这里的纽扣比你能在珠母纽王背上找到的还要多。