Sims wear default underwear/AA shorts when naked

indygerl​ 

Disclaimer: EA in no way recommend this. You are recommended to make a backup of your saves.

Steps:

1. You need to download and install the mod MC Command Center (google it).
2. Start the Sims 4 and click new game. You need to create two sims male and female. If you don't plan to play them later just chose random values you only need them for their nude outfit. Save them to your library and exit to the main menu.
3. Click load game and load the affected save.
4. Open the cheat console (ctrl-shift-c) and enter "testing cheats true" without "". Press enter. Type "cas.fulleditmode" without "" press enter. Close the cheat console.
5. Load your household in CAS. Open the Gallery and change to My Library. Select the household you made and choose to add them to the current household. Click the checkmark to save and exit CAS.
6. Select the male sim you created and order him to take a shower (or bath) when he spins into nude immediately pause the game.
7. Click on the naked sim and select MC Command Center. Click MC Dresser, click Copy/Paste and then Copy.
8. Order one of your males to shower and when he spins into nude immediately pause the game.
9. Click on the naked sim and select MC Command Center. Click MC Dresser, click Copy/Paste and then Paste.
10. Repeat step 8-9 for all your males.
11. Repeat step 6-9 with females.
12. You can now remove the two sims you created using Manage Household or by killing them. Shift-Click Kill
    
    

You can now continue to play with your family.