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
one piece - What's up with Nami's breast size? - Anime & Manga Stack Exchange
One Piece Creator On Drawing Boobs
Volume 99 SBS Question Corner – The Library of Ohara
How Well Does Oda Write the Straw Hat Women in One Piece?
One Piece-talk — The Wholecake foreshadowing! Chapter 830
Nami, One Piece Wiki
Oda explained why there are big breasts in One Piece - One Piece
The progression of Namis boobs. : r/OnePiece
Oda explained why there are big breasts in One Piece - One Piece
Theory to why there are massive boobs everywhere post-timeskip : r/OnePiece
Oda explained why there are big breasts in One Piece - One Piece
ONE PIECE' Renewed at Netflix - Netflix Tudum
Yamato, One Piece Wiki
What does the creator of the One Piece manga, Eiichiro Oda, have against romance? - Quora