Rightclick "bottomless.bat"
"Edit"
change the "D:\Games" portion of the path to where your ArcheAge folder is located
Save
Repeat for "clothed.bat" and "topless.bat"
After you're done, you can launch either.
bottomless.bat - will make your Nuian, Elven and Hariharan females, well, bottomless
topless.bat - will make your Nuian, Elven and Hariharan females, well, topless (and strip down the Ferre, albeit no hair and nipples)
topless.bat+bottomless.bat - ...you guessed it, fully nude
clothed.bat - restores the original game textures for all the of the above
Hope this helps, can't think of a way to further simplify it :)
P.S. - I haven't tried it on the NA client, as I'm playing on the Russian servers, but it shouldn't mess your files up either way - the script will warn you if the size of any of the files differs. Just cancel if it is.