If it's not too much work for you to draw or implement, maybe you could script the game to allow the player to choose from two or three lingerie choices - ranging from something kinda tame for more of a 'good girl', to something much more revealing for someone with far less inhibitions? Sorta like how they allowed the player to choose the MC's outfits, piercings, tattoos, etc in Good Girl Turned Bad. That way the player could dress the MC the way they envision her at the time, or want her to act in their particular playthrough story.
Alternatively, you could have the MC's sprite automatically change her lingerie to go along with her personality changes.
I'm not sure if either of those ideas are viable for what you envision for your game, but having some choice or variation would probably be more likely to satisfy the varied taste players have.
Anyway, just ideas - you should choose what feels best for you as the dev, since the MC and whichever direction she's going is your creation.