Kaftan: A Persian word describing a long straight garment with loose sleeves. These days we use the word kaftan to describe many long loose flowing garments. They are lovely and cool to wear and instantly make you feel like a film star. True fact: When ever I wear mine I can't help but waft about rather than just walking, I also feel the need to add large sunglasses, a wide brimmed hat and a martini.
There is a great potted history of the Kaftan on the Vogue website you can read here.