It replaces the default meshes or textures for the underwear and swimwear that appear in Create-A-Sim (CAS) and when a Sim is in their "undressed" state.
You can typically find these files archived on platforms like Sim File Share or via the creator's social media and Patreon pages. How to Use It [Noir and Dark Sims 4] EA underwear and swimsui...
These types of mods are designed to replace the basic, built-in EA underwear and swimsuits that Sims wear when they aren't assigned a specific outfit. Users often use them to give their Sims a more realistic or detailed look compared to the standard "painted-on" textures of the base game. Key Details about the Mod It replaces the default meshes or textures for