On the default setting, Sim bathing outfit will be used and it may look different from any currently selected outfit, so undressing will not only remove clothes but affect makeup and accessories.
Setting ‘Complete Undressing Type’ decides the way Sim will look when using the ‘Completely Undress Yourself’ interaction.
The additional layer of clothing will be gone, but no data related to it will be erased. Setting ‘Underwear Switch’ can disable underwear for all Sims in the game. All nudity interactions will be still available and fully functional, but only for the player. Setting ‘Naturism and Exhibitionism Switch’ can disable all nudity skills progression, basic undressing autonomy, and nudity story progression. This section only explains the most complex settings.