It is interesting to note the curious legend that the “pink” of the hunting field is not due to any reasons of optical advantage, but to an entirely different reason. Formerly no man might hunt even on his own estate until he had licence of free warren from the Crown. Consequently he merely hunted by the pleasure of the Crown, taking part in what was exclusively a Royal sport by Royal permission, and for this Royal sport he wore the King’s livery of scarlet.
A Complete Guide to Heraldry by A. C. Fox-Davies, pg. 73