To get the Goron Tunic go to Goron City as an adult and stop the little goron rolling on the 3rd floor with a bomb. Talk to him about the dragon and the gorons and he will give you the Goron Tunic. To get the Zora Tunic go to Zora's Domain as an adult and unthaw King Zora with a bottle of Blue Fire from the Ice Cavern or the Potion Shop.