Meaning

noun thick woolen fabric used for clothing; originated in Scotland

noun (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth

originAttested since the 1830s. Probably a shortening or back-formation from Scots tweedling (“a type of twilled cloth”), attested since the 16th century and related to tweedle; the two words are variants of tweeling and tweel, which go back to Middle English twel, twyle (“a type of woven fabric; twill”), whence also English twill. Scottish tradition says it derives directly from tweel when an English…

Etymology from Wiktionary, CC BY-SA 3.0