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 MOO MOO DRESS W SEAHORSES Pharm Favorites by Economy Pharmacy The muumuus with the buttons @muuvmentbyfee #muuvmentbyfee #muumuu # moomoo #kaftan #comfortablefashion Hawaiian Muumuu Sleeve Dress Semi Long [Crack Hibiscus] Blue 2XL Cotton