That clothing damage controller thing from NG+ seems to only increase clothing damage not decrease it. But back when it was 'purchased' from the shop it was said to be able to 'fix' clothes. Clearly it didn't mean to fix the clothing damage at this point.
How do you get a B+ Ending ? , Btw I think there is a bug where when you save Annaette And go take down her Husband in the test room after u defeat the prompt for "Take him down" still triggers
Haven't tried it myself as I'm waiting for more content in the game, but I'd suggest MTool
Works with a massive variety of games provided it supports the game engine (it support RPGM so it should work for this).