Hakama
Hakama (袴) are a type of traditional Japanese clothing resembling a wide, pleated skirt. They were originally worn only by men, but today they are worn by both men and women. Hakama are tied at the waist and fall approximately to the ankles.
There are two types of hakama, divided (umanori 馬乗り, "horse-riding" hakama) and undivided (gyōtō hakama 行灯袴). The umanori type are divided like trousers, but nearer the bottom of the garment. Both types are identical in outside appearance. A third type, "mountain" or "field" hakama, were traditionally worn by field or forest workers. They are looser in the waist and narrower in the leg.
Hakama are worn over a kimono. There are four straps, a long one on either side of the front of the garment, and a short one on either side of the rear. The rear of the garment has a rigid board-like section and a toggle which is tucked into the rear of the obi, and helps to keep the hakama in place.
Hakama were originally worn by samurai; it is often mistakenly said that they used it to disguise their footwork and stances from an enemy, but in reality the warrior would tuck the hakama up through the belt when a confrontation was imminent, just as the sleeves of the kimono were tied back with cord.
Later on, hakama were also used to protect clothing from dirt and tearing.
Hakama have seven deep pleats, two on the back and five on the front. The pleats are said to represent the virtues considered essential by the samurai. Many martial artists continue this tradition, but different sources give different meaning to these pleats.
Source : http://en.wikipedia.org/wiki/Hakama