1911 Encyclopædia Britannica, Volume 27… (1911)
“ They are a tall people, the chiefs being especially noted for their powerful build. They dress generally in a black tunic (some tribes wear white) , trousers girt with a woollen belt, and wear as turban a cloth called litham, the end of which is drawn over the face, allowing nothing to be seen but the eyes and the tip of the nose. The purpose of this is to protect the throat and lungs from the sand. These cloths are dark blue or white: the former being worn most by the nobles, the latter by the common people. To this difference of colour is due the terms “black” and “white” Tuareg. ”
