KNOWLEDGE IS POWER

In the English Civil War, since they were people of the same culture and same (original) government fighting in the same armor and the same clothing style, and didn’t have a whole lot of time, on account of it being a civil war, to prepare nice forms of distinction, simple colored sashes were commonly worn by officers and cavalry - either around the chest or around the arm - to distinguish friend from foe.

Later in the war, the New Model Army would use proper uniform coloring.