just wonder is it a bug that Red's bust doesn't show in battle when naked, or that just not implemented yet?
It depends on what you mean actually. She SHOULD display if your armor is broken. However when thinking about it more I think there is an oversight should your clothes get stolen by the Drunkard that I didn't properly implement.
So if it's the latter I can make a fix for that easily. If it's NOT I'll need a few more details to figure out what's going wrong. So just let me know what exactly happened in that case, and I'll try to fix it.