There's a bug where I can't take off the cow outfit anymore. If I try to change clothes I get an error and my game crashes. I just got that outfit too.
Viewing post in Pokémon Naughty version comments
Update: Yes, going back to craft the night gown fixes the issue. The game sets it in the third slot of your wardrobe, which is what the game seems to always expect to be there, therefore breaking if anything else is there.
At least your save isn't perma-fucked, but I'm still surprised the dev never thought of this happening.