Never mind, I eventually got it while fighting the last boss, Fox King. Looks like 'Wonderman' used to be with 'Superwoman' and now she is teamed up with 'Chosen' from Page 5.
Just wondering if anyone else is missing a single item on page 8? I've killed every enemy and have every other complete costume. There's just this one single item outfit that I seem to be missing.
 "StrikeForce Kitty"){kind=icon}
 "Thrones of Fantasy"){kind=icon}
 "Give Up"){kind=icon}