Show Me Your Mumu Bonfire Sweater in Green. - size S (also in XS) Show Me Your Mumu Bonfire Sweater in Green. - size S (also in XS) Cotton blend. Hand wash cold. Knit fabric. SHOW-WK14. MS7 228. Mumu is not simply a garment, it is a lifestyle. Spontaneous. Fun. Easy going. Unique. Versatile. Imaginative. It all encompasses the mumu, and a way of life.