I surprisingly don't mind Nami's skimpy attire, I don't know if it's because the body types are so cartoony I can't really equate it to something vulgar lol. She knows she's cute and much like Boa she uses that to get what she wants. And well the use of fan service with her isn't constantly in your face or always out of place unlike scenes in Fairy Tail and Kenichi, I feel.
At any rate the guys can have their Nami and Robin fan service. I get my Zoro lol.