Perhaps originally, ten or fifteen years ago, the American woman who first knitted a pair of these socks for husband, son, or sweetheart did follow the traditional plaid pattern of the clan of Campbell of Argyll, light green crossed with dark green, and narrow independent cross lines of white.
If so, though the name was retained by followers who adopted the idea, the plaid speedily lost all resemblance to that claimed by the Scottish clan.
The Argyll sock of today’s American, whether home knitted or machine produced, has become a variegated plaid affair of bright colors.