tunic -
A garment worn over the torso, with or without sleeves, and of various lengths reaching from the hips to the ankles.
Wikipedia
A tunic is any of several types of clothing for the body, of various lengths reaching from the shoulders to somewhere between the hips and the ankles. The name derives from the Latin tunica commonly worn by both men and women in Ancient Rome, which in turn is based on earlier Greek garments. The Roman tunica was worn by citizens and non-citizens alike; citizens, though, might wear it under the toga, especially at formal occasions.
