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clockwise from top left: Malcolm, Gordon Dress, and Stewart Dress plaid patterns
a. Cloth, often made of wool, with a tartan or checked pattern.
b. A pattern of this kind.
2. A rectangular woolen scarf of a tartan pattern worn over the left shoulder by Scottish Highlanders.
[Probably Scots plaid, plyd, past participle of ply, to fold, from Middle English plien; see ply1.]
plaid, plaid′ed adj.