I have seen Tanaka Miku in Bubka Magazine. I amazed that Miku has a very big bust. Beside Miku I also amazed with Jonishi Rei. How about you guys do you know another member who own a big bust size ?
What a great topic, something I can get on board with Regarding big busts, Jonishi Rei and Yokono Sumire of NMB48 stand out, maybe Abe Wakana too (must be something in the Osaka water supply). Historically speaking from the graduates I'd say the biggest were Yamaguchi Yuki aka Yuppi from NMB and Sato Seira from SKE48. Kuramochi Asuka (AKB), Tanaka Yuka aka Yuutan (HKT), Sugamoto Yuko (HKT) aka Yuukoso also.
I've just had a browse through the S48 Wiki and the member with the largest bust size I can find is Oshima Mai with 89cm. Second is Sato Seira with 88cm and the third biggest I can find is Hirata Rina with 87cm (according to the sleeve notes on her latest DVD). No size is given for Yamaguchi Yuki on the S48 Wiki but this Japanese wiki page gives a figure of 86cm.
There was also oppai senbatsu in 2015 manatsu tandoku concert in SSA (the one with ricchan gradcon). The center was Kojiharu, then the others were Kojima Natsuki, Hirata Rina, Natori Wakana, Sasaki Yukari, Ishida Haruka, Uchida Mayumi, and Mogi Shinobu. Also, I remember I was surprised at Nito Moeno's gravure shots.
Uniforms are very misleading for this topic, gravure sessions are necessary. Ex-AKB48: Nana Owada, Natsumi Hirajima, Hikari Hashimoto... AKB48: Mion Mukaichi (She is my Oshi). HKT48: Meru Tashima. NMB48: Miru Shiroma.