Originally worn in the middle ages, 'tabard' suggests historical or fantasy settings, like in novels or films. The film set designers created tabards true to the medieval era.
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Ceremonial Use
'Tabard' can imply formality and ceremony when used in the context of official or state occasions. The master of ceremonies donned a formal tabard for the procession.
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Displays Allegiance
Historically, a tabard often showed which lord or lady the wearer served, revealing allegiance. At the joust, each knight's tabard bore their liege's colors.