Ninna wields some special orbs in different colors. These orbs summon clothes for her instantly when attached in her chest. Here are the examples of clothes summoned by 5 orbs

Red orb: School girl uniform
Yellow orb: Beach outfit (only the bikini is summoned. The white lace tunic and the flower, she dressed herself)
Gray orb: Maid outfit
Blue orb: Gala dress
Green orb: E-girl clothes (even her hair color is changed by this orb)