Arc was experimenting in act 1, so some things don't carry over into act 2.
One of them is the outfits system, now it only affects sex scenes or specific scenarios.
Turns out it would be quite wonky to have the girls be like "Hang on, lemme change" every time you do a story event with them.
And making outfit alts for the events would be a headache, since this is not rendered in real time.