The dress of the people of Khorassan is traditionally more protective. The region is situated in the East of Iran. Both the men and women of Khorassan tend to wear trousers that are extra baggy and large.
The traditional fashion calls for more solid colors. A large solid shirt with a round collar is a typical look for the male. For women, dresses are worn on top of the trousers that reach below the knee.
A head dress is worn. This would be a scarf for a woman and usually a turban for the man. In addition, large shawls are draped over the head or body depending on climate and weather as shown in the image.
Reference: http://english.tebyan.net/