Livery

A livery /ˈlɪvəri/ is a uniform, insignia or symbol adorning, in a non-military context, a person, an object or a vehicle that denotes a relationship between the wearer of the livery and an individual or corporate body. Often, elements of the heraldry relating to the individual or corporate body feature in the livery. Alternatively, some kind of a personal emblem or badge, or a distinctive colour, is featured.

The word itself derives from the French livrée, meaning dispensed, 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 medieval phenomenon of bastard feudalism, livery badges worn by the "retainers" of great lords, sometimes in effect private armies, became a great political concern in England.

In the 14th century, "livery" referred to an allowance of any kind, but especially clothes provided to servants and members of the household. Such things might be kept in a "livery cupboard".

During the 14th century, specific colours denoting a great person began to be used for both his soldiers and his civilian followers (often the two overlapped considerably), and the modern sense of the term began to form. Usually two different colours were used together (and often with a device or badge sewn on), but the ways in which they were combined varied with rank. Often the colours used were different each year. As well as embroidered badges, metal ones were sewn on to clothing, or hung on neck-chains or (by far the most prestigious) livery collars. From the 16th century onwards, only the lower-status followers tended to receive clothes in livery colours (whilst the higher status ones received cash) and the term "servant", previously much wider, also began to be restricted to describing the same people. Municipalities and corporations copied the behaviour of the great households.

...
Wikipedia