https://wccftech.com/why-square-enix-redesigned-tifa-less-busty/

Tifa Lockhart was among the fan-favorite characters of FFVII. Even back then on the original PlayStation, well, let’s just say her physical features (in addition to her lovely, protective attitude) were memorable for many fans. With the upcoming FFVII remake, though, Square Enix clearly redesigned her character model to be far less busty than it was in the original, as showcased in the recent E3 2019 gameplay where Tifa appeared for the first time.

Game Director Tetsuya Nomura explained to the latest Weekly Famitsu magazine (as translated by Gematsu):