Collar-day (A)
. In royal levees, means that attendants are to wear all their insignia and decorations, such as medals, stars, ribbons, and orders. This is done on grand occasions by order of the Crown. The Queen’s Collar-day is when she wears the Order of the Garter.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.