Definition & Meaning of "men in (gray|) suits"

What is the origin of the idiom "men in suits" and when to use it?

The phrase "men in suits" originated in the mid-20th century when corporate culture became more formalized, and the business suit became a symbol of authority and power. It became popularized in the 1950s and 1960s and is still used today to describe those in positions of power and authority who are seen as out of touch with ordinary people.