corduroy: [18] Popular etymology usually associates corduroy with a supposed French corde du roy ‘cord of the king’ or even couleur du roy ‘king’s colour’ (the original corduroy having according to this theory been purple), but in fact there is no concrete evidence to substantiate this. A more likely explanation is that the word’s first syllable represents cord in the sense ‘ribbed fabric’, and that the second element is the now obsolete noun duroy ‘coarse woollen fabric’ [17], of unknown origin. [corduroy etymology, corduroy origin, 英语词源]