One the one hand: It's just a texture and shouldn't warrant such a huge outrage.
In the other hand: The "teenage-girl with skimpy outfit"-trope is something that occurs so often in Japanese media, that some might even refer to it as pop-culture.
So now you have a Japanese developer changing an aspect of a game sold in Japan because of the mismatch with the foreign culture.
Think about this: GTA games in Japan were often censored so that you cannot kick a person on the ground and civilians wouldn't drop money when killed. What would everybodies reaction be if Rockstar made that edit to every version of the game, just to adjust to Japan's market?
Actual riots on the street.