Vintage Fashion Guild : Fabric Resource : Harris Tweed, Fabric All tweed labeled Harris must have the official orb and cross certification mark, and it can not have that mark unless it is "cloth that has been handwoven by the islanders of Lewis, Harris, Uist and Barra in their homes, using pure virgin wool that has been dyed and spun in the Outer Hebrides" (from the Harris Tweed Authority website).