QUESTION: Why does Father Christmas wear a red suit?

ANSWER: Many people believe Father Christmas only started donning a red suit after Coca Cola drew him that way for an advertising campaign in the 1930s. The truth is, he was rocking scarlet long before the carbonated soft drink got in on the action. The colours red and white are said to be the traditional bishop robe hue of Saint Nicolas that dates way back to the 4th century.

source: marieclaire.co.uk/life/christmas-traditions-answered