Technically, according to Vogue, a caftan (or kaftan) is a “narrow cut, long robe with full sleeves, either with a deep open neck or fully open to the floor,” with origins in ancient Mesopotamia. The muumuu comes from Hawaii, and the word means “cut off” ― a reference to the original garment's yoke-less neckline.

What do you call a Moomoo?

The muumuu /ˈmuːmuː/ or muʻumuʻu (Hawaiian pronunciation: [ˈmuʔuˈmuʔu]) is a loose dress of Hawaiian origin that hangs from the shoulder and is like a cross between a shirt and a robe. ... Muumuus are also popular as maternity wear because they do not restrict the waist.

What is the difference between kaftan and caftan?

a loose shirt or top. A kaftan or caftan (; Persian: خفتان‎ khaftān) is a variant of the robe or tunic, and has been worn in a number of cultures around the world for thousands of years and is of Asiatic origin. In Russian usage, kaftan instead refers to a style of men's long suit with tight sleeves.