Tweed was once thought to be a misreading of the word ‘Tweal,’ which is the Scottish pronunciation of twill. The Fabric’s association with the River Tweed, was the largest location for the weaving industry in the 19th century. Tweed is a rough textured fabric, woven from a multitude of different patterns. At the end of the 19th century it has been used for coats and suits. It reemerged in the 1990′s after falling out of favor in the 1960′s.
Source: The Thames and Hudson Dictionary of Fashion and Fashion Designers