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there's more to it than just the navel. it's the stomach, the groin, the lower parts of the ribcage. on the back, there's the spin, the dimples of venus.
the fact that gardenia's shirt cuts directly below her breasts -- there's a distinct aspect of eroticism in gardenia's design. It's not lewd per-se, but a loving display of the female form wrapped together with her tomboy-ish personality.
I don't even know what her design is supposed to evoke in terms of theming. A park ranger is the only thing I could guess at.