Tabi(足袋) are traditional Japanese socks dating back to the 15th century. Ankle-high and with a separation between the big toe and other toes, they are worn by both men and women with zori, geta, and other traditional thonged footwear. Tabi are also essential with traditional clothing—kimono and other wafuku as well as being worn by samurai in the feudal era. The most common colour is white, and white tabi are worn in formal situations such as at tea ceremonies. Men sometimes wear blue or black tabi for travelling. Patterned and coloured tabi are also available and are worn most often by women, though they are gaining popularity among men as well.