100% wool
The word "tweed" is an English variant of the Scottish word "tweel", itself a variation of "twill". Tweel refers to hand-woven wool fabric from the Scottish highlands and islands. Historians differ on whether tweed originated in the highlands or the south of Scotland. The name became associated with the Tweed River which forms part of the boundary between England and Scotland. Tweed eventually became the general term for all carded "homespun" wool, whether it was Scotch tweed, Irish tweed, Donegal tweed, Cheviot tweed or Harris tweed