[Mears]

Muumuu is not an English word.

[Swordmaker]

Muumuu is not an English word.

Actually, it is. English is a language that just doesn’t borrow words from other languages, when English encounters a new language, it brow bears, mugs, and steals that languages’ words, files the serial numbers off, and incorporates its unique words into the Mulligan Stew that is the English tongue.

[Savage Beast]

Oxford Dictionary of English

muumuu |ˈmuːmuː| noun
a woman's loose, brightly coloured dress, especially one traditionally worn in Hawaii.
ORIGIN early 20th century: from Hawaiian mu'u mu'u, literally ‘cut off’.

Apologies will be accepted as made.

You’re welcome.