I know is kind of a week late, but I think Rebecca (the warrior girl) is using a very similar outfit that Red Sonja (a character from Marvel Comics) uses, there are just minor differences. So its not so much as Oda-sensei doing the fanservice, it is more of a shoutout from another work.
mmm yeah it does bare similarities!
I guess it could be Oda not just giving fanservice but at the same time, that doesn’t change it from being kinda ridiculous ahahah
oh well that’s fine! thx for the info my friend!