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 Other House Dresses With Pockets Moo Moo Nightgown Short Sleeve Mumu Dress Lounge Poshmark Red MooMoo Dress SHANTELL'S GIFTED BOUTIQUE The muumuus with the buttons @muuvmentbyfee #muuvmentbyfee #muumuu # moomoo #kaftan #comfortablefashion Oudiya Womens Mumus House Dress Floral Print Short Sleeve Nightgowns Moomoo Dresses with Pockets, Women's, Size: Medium, Green