Twill is a type of tweed that is made from a plain weave fabric, which is characterized by its diagonal pattern. Harris tweed is a type of tweed that is hand-woven in the Outer Hebrides of Scotland and is known for its durability and warmth. Donegal tweed is a type of tweed that is made in Ireland and is characterized by its bright colors and intricate patterns. All three types of tweed are popular choices for clothing and accessories.