My Grandfather frequently wore overalls as a farmer in rural Nebraska. But he, like most functional human beings, knew when to put on decent attire. Compare my Grandpa to Justin Bieber, who wore the above outfit when meeting his country's Prime Minister, Stephen Harper. After being (rightfully) tongue-lashed for his slovenly choice in clothing, Bieber responded with a highly insulting cop-out: "Wow am I ever White Trash."
Bieber might be intrigued to hear that many people who are actually white trash would have the basic decency to dress appropriately in such a circumstance.