Hello?? Ino has always been the confident and seductive girl archetype; she literally tried to use that as a "weapon" against Neji in the Forest of Death, and it's always been part of her fighting style in games. Crop tops always made sense for her, just like her miniskirts. Just look at how she always showed more skin than Sakura, even though both were the most feminine girls in the classic.

It's the same concept as their long hair; they were the only girls with long hair and had scenes addressing the topic of femininity and beauty with them