My Modern Reference Encyclopaedia (c.1939) decribes tartan (plaid) as: 'Woollen cloth woven in coloured stripes crossing ar right angles, in various patterns, formerly produced only in the Scottish Highlands, where each clan was distinguished by its own pattern'
The Concise Oxford Dictionary (1964)has: 'PLAID ...n. Long piece of twilled woollen cloth, usu. with chequered or tartan pattern, outer article of Highland costume; cloth used for this... [Gael. PLAIDE, of unknown orig.]
In Robert Bain's 'Clans & Tartans of Scotland' (1959): 'What may be one of the earliest references to Royal use of tartan is contained in the accounts of King James III in 1471 where mention is made of tartan purchased for the King and Queen. King James V wore tartan when hunting in the Highlands in 1538, and [English] King Charles IIwore tartan ribbons on his coat at his marriage in 1662.' (Lots of interesting historical information in there, including lists of the clans - but definitely no mention of the Musselwhites.)
All this by way of confirmation thatunless there is an established connection with a Scottish clan, plain-ole-English folks do not have a plaid of their own - sorry!