Why the red coat?
It has been said in some circles that the British Army used red coats for their uniforms as a way to hide blood should a soldier get shot. This could be important to the moral of a unit. It would be hard to see who was wounded and who was not. Such consideration is foolish and patently untrue. While the red may hide the blood, the gaping holes in the fabric would probably be a giveaway. Also, they wore white pants, which are not good for hiding the blood that would accompany most wounds. So the question is why red?
In the days before synthetic dyes made almost any color cheap and easy to produce, some colors were more difficult and expensive to dye into clothing than others. Red and purple were by far the most difficult. Which is why they were used to project a sense of power. Purple has long been associated with kings and red with the Catholic church, the two groups that could afford the most expensive dyes.
So cladding their army in coats of red was meant to project power onto the battlefield. A sense of status to the soldiers themselves. Yet it was very expensive so the British put a little twist on it. The red dye for the enlisted men’s uniforms came from madder, a plant that is actually in the coffee family whose roots will provide a reddish color. Still costly, but affordable to the army. The officers however needed a red that was a little brighter and would stand out from the enlisted men. Their uniforms were dyed with cochineal, which is an insect. Yep, their uniforms were dyed with dead bug shells.