The muumuu or muʻumuʻu (English pronunciation: mu mu) is a loose dress of Hawaiian origin that hangs from the shoulder. Like the Aloha Shirt, muumuu exports are often brilliantly colored with floral patterns of generic Polynesian motifs. Muumuu for local Hawaiian residents are more subdued in tone. Muumuu are no longer as widely worn at work as the Aloha Shirts, but continue to be the preferred formal dress for weddings and festivals such as the Merrie Monarch hula competition. They are also frequently worn as a uniform by women working in the hotel industry. Muumuu are popular because they do not restrict the waist.
Originally it was a shorter, informal version of the more formal holokū. Holokū was the original name for the Mother Hubbard Dress introduced by the missionaries to Hawaii in the 1820s. While the traditional Mu Mu is very loose, there are adaptations with a bit more style while they still maintain the essential "loose comfy" feeling to them. Here's some colorful samples of a variety of colorful Mu Mus from The Hula Hut!