Harris Tweed is a unique product with a prestigious worldwide reputation used for a variety of product applications. To be sold as Harris Tweed certain conditions have to be met regarding yarn type, method and location of production. Due to locational specification, the Harris Tweed Industry is vital to the economy and community life in the Outer Hebrides, Scotland. However, the industry has an ageing population and knowledge of existing design processes remains embedded in the minds of a handful of individuals who have worked in the industry for many years. Design innovation methods for Harris Tweed fabrics are minimal. The author, a design researcher, undertook an empirical investigation into Harris Tweed design practices and processes, supported by Harris Tweed Hebrides and the Harris Tweed Authority . A series of practical investigations were conducted to extend the existing situation and offer proposals for innovation. The project resulted in the creation of the ‘Four-Shaft’ and ‘Eight-Shaft’ Collections of textile samples. ‘Four-Shaft’ designs can be produced using existing Harris Tweed looms, whereas ‘Eight-Shaft’ designs require loom adaptation. The company Harris Tweed Hebrides selected designs from the Collections for production, presentation to customers and to prompt further discussion regarding loom adaptation within the Harris Tweed industry.