I love this game, perhaps I can try to translate it, as I did with Roshutsu 2 (a game that also follows exhibit/public exposure), although I havent uploaded it yet).
I've found one some tips about what each costume does in Leona game here
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Some are deep inside the holes in the ground (a person put some locations here)
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Remember that, for Leona to learn new inventions, you need experience (from battles), while wearing the outfit. Just press ESC, go to Enhancement, press ENTER in the current outfit (here is 'Journalist', as an example), then press ENTER again. You will see something like 'Learning Idea of Printer: EXP 300'. Once you got that experience (the tougher the enemies, faster you get that EXP), just go to that menu again and click in the Learning option you want (that is not automatic).