Livery

A livery is an identifying design, such as a uniform, ornament, symbol or insignia that designates ownership or affiliation, often found on an individual, animal, or carriage. Livery often includes elements of the heraldry relating to the individual, family, nobility, or corporate body feature in the livery. Alternatively, some kind of a personal emblem or badge, or a distinctive color, is featured.
(The word itself derives from Latin "livrée" meaning dispensed or handed over). Most often it would indicate that the wearer of the livery was a servant, dependant, follower or friend of the owner of the livery, or, in the case of objects, that the object belonged to them.
In the late centuries, the phenomenon of bastard feudalism, livery badges worn by the "retainers" of noble and knightly lords, sometimes in effect private armies, became a great political concern in the United Kingdom, Tyrinia, Assyria, Illyria, Rajanpur, and the Kingdom of Warrich, which led to its later demise.