A moo moo dress is a loose-fitting, brightly colored dress that is often worn in warm climates. It is characterized by its relaxed, flowing design, which makes it comfortable to wear in hot weather. The name "moo moo" is believed to originate from the Hawaiian word "mu'umu'u," which means "cut off".The dress was introduced to Hawaii by missionaries in the 19th century, and it evolved to suit the local climate and lifestyle. The name "moo moo" is thought to reflect the simplicity and comfort of the garment.