Why do the Dutch wear Orange?

The Dutch wear orange NOT because their flag is orange (the Dutch flag is actually red, white and blue).

However, the first Kind of the Netherlands was William of Orange (Willem van Oranje), who come from the House of Orange-Naussau; one of the most influential royal house in Europe in the 16th and 17th century.  Originally this house started in the Principality of Orange (France).

This principality was named after a previous Roman-Celtic Settlement (Arausio) - but it was also know for being on the route where oranges came into the country.

The family of the Prince of Orange officially adopted the name and the colour orange in 1570. After the Eighty Years' War (1568-1648) against the French, the Dutch became independent first as a republic. In 1815, the Netherlands became a monarchy under the House of Orange-Naussau.