Show Me Your Mumu Berkeley Zip Up Bells. - size 25 (also in 24) Show Me Your Mumu Berkeley Zip Up Bells. - size 25 (also in 24) Cotton blend. Zip fly. Back patch pockets. Intentionally faded stretch denim. Frayed leg openings. 13 at the knee breaks to 30 at the leg opening. SHOW-WP85. MDF9 264. 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.