Red coat (military uniform)

A red coat, also referred to as a redcoat or a scarlet tunic, is a military garment formerly much used by most regiments of the British Army, so customarily that the term became a common synecdoche for the soldiers themselves. The red coat was widely (though not exclusively) used by the infantry and some cavalry units of the British military plus the Royal Marines, from the 16th to the early 20th centuries.

Source: Wikipedia — Red coat (military uniform) (CC BY-SA 4.0)