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 LOUSEA Moo Moos for Women Blue Embroidery Print Kaftan Dress Crewneck Oversized Caftan Dresses Lightweight Swim Coverup Dress (Blue,One Size) at Amazon Women's Clothing store MOO MOO DRESS W SEAHORSES Pharm Favorites by Economy Pharmacy Hawaiian Muumuu Sleeve Dress Semi Long [Crack Hibiscus] Blue 2XL Cotton