So why do we call this a Muumuu? Well, linguistic spread & tourism, mostly. Your granny might have worn Muumuus as they were popularized in the US as house dresses, maternity wear & nightgowns, but What Is a Mumu, Muumuu or Moomoo Dress? Meaning and Origin Ekouaer Womens House Dress Floral Print Moo Moos Nightgowns Moomoo Dresses Mumus with Pockets Floral Purple L : Target Is there a word for this kind of Mexican mumu? : r Spanish dresses pockets moo moo nightgown short sleeve mumu dress Temu