Glad you're enjoying it! As for your question, earlier builds (Pre 1.0) DID include proper equipable underwear beyond what is currently in the game. You'll also find proper panties in chapter 2 if you check the status screen. But this has not returned simply because I'm prioritizing making more brand new content rather than having to do all the variant arts that came with underwear (alt versions of certain sprites, battle cgs, event cgs etc.). Eventually it will likely return but that will probably be off near the very end of the dev cycle.