I honestly figured it out by accident again my apologies =/
Let me explain the problem.
If you don't use any modding method to alter the basebody, when you modify any part of the outfit which uncovers skin that wasn't previously visible, you get a hole in the body because there is no skin mesh underneath.
It's called clipping, the game developers use it to save on computer resources, afterall there is no real need to display parts of the basebody that are hidden under clothing.
This limits what you can do to any outfit beyond making skirts shorter and removing extra bits that stick out or hang off from them.
You want to see your Tamer's butt cheeks, we can make it happen, but first we have to stop the basebody clipping on her body so that when we take her shorts/panties off her naked skin is showing instead of a hole.
Giving the Tamer a full basebody skin mesh allows her to be shown naked or wearing as much or little of an outfit as you want, but there's a new problem.
The outfits are designed to fit over the clipped basebody, not the full basebody skin mesh, so what we find is the outfits are often slightly too small resulting in parts of the skin poking through the material. This can happen when she's standing still or only appears when she moves, but it looks pretty bad.
So now instead of basebody clipping being a problem, it's clipping through the outfits.
It's an issue for all classes, but it's worst of all on Tamer outfits, in fact most of the standard Tamer armors are ruined by it.
I spent hours working on some of them to try and create mods that worked, but the results were awful.
In the end I had to swap out almost all of the standard Tamer armors for costume sets which didn't have such bad clipping issues and even modding those was hard work without sometimes having to remove more of the material than I really wanted to.
So I'm not saying what you'd like to see for your Tamer to wear is impossible, just that your options are more limited than perhaps you first thought.
If you've got a particular project armor you'd like me to look at, feel free to ask, giving me an idea how you'd like it modded and I can see what I can do. I already looked at most of them, so I have a pretty good idea what can and cannot be done.