According to Merriam-Webster the term bigwig, as we know and define it today, was first used in 1703. Bigwig has its origin in Europe where wearing wigs, especially by men, became an aristocratic trend in the 17th century. The large and elaborate wigs became a symbol of status and importance. The wigs eventually became smaller, but by then the term was already established in the lexicon. Today’s bigwigs don’t wear wigs, or at least won’t admit to it, but they still hold power. [Source.]
