the word 'tweed' originates from a mid-19th century misreading or commercial alteration of the scottish word 'tweel', which is the scots form of 'twill', a type of fabric weave. the alteration is popularly attributed to association with the river tweed, which flows through a major scottish textile region. this association, whether accidental or deliberate, linked the fabric firmly to its scottish origins in the public mind. thus, a simple weaving term was transformed into a name for a distinctive cloth and, by extension, the classic style of clothing associated with it.

the word is a simplex loanword. it does not contain separable morphemes in its modern english form.