Gabardine is a tough, tightly woven fabric used to make suits, overcoats, trousers and other garments. The fibre used to make the fabric is traditionally worsted wool, but may also be cotton, synthetic or mixed. The fabric is smooth on one side and has a diagonally ribbed surface on the other. Gabardine is a form of twill weave.
Burberry clothing of gabardine was worn by polar explorers including Roald Amundsen, the first man to reach the South Pole, in 1911, and Ernest Shackleton, who led a 1914 expedition to cross Antarctica. A jacket made of this material was worn by George Mallory on his ill-fated attempt on Mount Everest in 1924.
— from BBC News Online