Superman

In order to secure the licence to produce a "Superman" cartoon, the founders of Filmation got several of their friends to set up a faux animation studio. They invited representatives from DC Comics to tour their facility, where they saw what looked like a large, busy production staff. In reality, the staff of Filmation was much smaller.

In most instances, whenever Clark Kent changes into Superman, he has on his blue suit. But when the Superman costume is revealed, he is seen removing a white coat.

Edited from The Adventures of Superboy (1966)