Oda explained why there are big breasts in One Piece - One Piece

Oda explained why there are big breasts in One Piece D: We realized that Robin has huge breasts. We checked from the side, and Nami also has huge breasts. Why do they both have such huge breasts? And could it be Oda-san's preference? That was a question from us two 10-year-olds. P.N. Sakucchan & Yuzu-chan 

Yamato, One Piece Wiki

Oda explained why Robin's and Nami's - ONE PIECE Fanpage

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Semiotics on One Piece “Chest”: The Big, The Flat, and The Drag., by Annisa Rianti

Semiotics on One Piece “Chest”: The Big, The Flat, and The Drag., by Annisa Rianti