This involves editing a game file, so make a back-up of the file prior to making changes.

Go to the /Singles/Config directory in your game folder. Locate the Game.* file and open it using a text editor (such as Notepad). Scroll down the notepad and locate the following lines:

# level of nudity lon = (there should be a number here)

Change the number so the two lines look like:

# level of nudity lon = 10

Be sure to save the file as what it was (and not save as, which only allows for TXT and other non-game cfg files). If you're still not seeing anything, it's probably because you haven't bought a dresser yet. Buy one, and click on it to bring up the appropriate command to shuck off all clothing.