I think it would be a pretty cool feature if you could buy a chest or wardrobe or something like that so you could store clothing that you've stripped off people so they can't wear it again, but have it not count against your inventory cap, or maybe just toggle on/off clothing that you've "registered" in it by having stripped it before. It seems more sustainable of an option than just expanding the inventory space all the time so you can fit all the characters' clothes.
Another cool thing you could add would be some sort of "lewd store" maybe run by a succubus NPC or something like that. There you could buy maybe some sex toys, but mainly you could buy aphrodisiacs, which you could use on the girls to make them hornier instantly with minor stress raises, or maybe could even be used on yourself/have male/female versions, so that could could cum more easily for those who want to cover girls in cum. Or maybe it could be just a potion shop run by a witch NPC, and might have some other types of potions, like a Calm potion, that could make NPCs less angry at you (or maybe an Angry potion just in case you want to summon the guards), or maybe a clothes-dissolving potion, which would dissolve one article like it was stolen, but you wouldn't get it in your inventory.
Another good feature would be the ability to "reverse pickpocket" like you can do in Skyrim, to put items back onto the girls from your inventory, and maybe, if you were feeling particularly ambitious and wanted to build on the mechanic, you could add extra clothing that you could give to each girl that would replace her normal clothes in that slot until stolen back. Like, maybe a shorter skirt for the shopkeeper or a chainmail bikini for the town guard. Or you might even be able to take the clothes off one girl and put them on another, which would be pretty cool.