Livery gown

the gown worn by a liveryman in London.

See also: Livery

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
When a freeman becomes a liveryman the candidate is said to be "enclothed" when a livery gown is placed on them at the court and they are seen at the next formal or social occasion wearing it.