Kurti is an Indian name of Tunic. A Tunic or Kurti is very popular outfit can use wear for casual ware and fancy version for partyware.
What Wikipedia says about Tunic...
A tunic is any of several types of garment for the body, usually simple in style, reaching from the shoulders to a length somewhere between the hips and the ankles. The name derives from the Latin tunica, the basic garment worn by both men and women in Ancient Rome, which in turn was based on earlier Greek garments.