I'm having a little problem with skinning. (Disclaimer: I don't actually know that much about skinning. I can make custom .bmp files, but that's about it.)

Okay so. I have a set of custom nude skins assigned to a specific skin tone. I've noticed that nude skins seem to be connected to casual wear - with custom nude skins that I've downloaded from other sites, the custom skin only shows up if I use a corresponding casual outfit.

Now, all that being said - how do I make it so that the custom nude skins display when a certain casual outfit is used?