"No matter what, never wear too many colors...especially during formal occasions, " the book said.

WSJ: For Beijing, Etiquette Isn't a Game

For formal occasions, she almost always stepped out in gowns by fashion insider-only names like Naeem Khan, Peter Sorenen, Doo.ri Chung, Rachel Roy and J.

FORBES: First Lady Michelle Obama Wears Jason Wu For The 2013 Inauguration Ball

In 1985 he went freelance, working regularly for a handful of families who wanted help on special occasions such as formal dinners and shooting weekends.

ECONOMIST: Domestic labour