Definitions of kurta:

Variously described in the dictionaries as "a tunic, waist coat, jacket, shirt", the kurta became popular in the 18th and 19th centuries essentially as a slightly loose-fitting garment for outer wear, often with a round neck, of knee-length or even longer, with side-slits at the hem and generally flared skirt. It acquired great elegance as a garment in centers like Lucknow and Hyderabad.
www.fashionindia.net/glossary.htm

tipper garment worn by both men and women in North India, generally A-line shaped and calf length.
www.coop4coop.org/highlight/dastkar/glossary.htm

long shirt worn by both men and women in the northern sub-continent, over a pajama (men) or salwar (women)
www.subir.com/rushdie/glossary.html

India A loose, long shirt
www.britishempire.co.uk/glossary/k.htm