Hue-shifting is a
Loader thing.
moreClothing hooks onto the Loader's hue-shift ability and exposes hue controls for specific items (shirts, tattoos, etc). The major advantage of moreClothing, of course, is that it can do this even if the original author of your clothing mod didn't know or care about hue-shifting.
The Loader will automatically seek a
HueData.txt file whenever it activates a
Character Folder. So after you've saved your
HueData.txt file (by clicking the very small "Save" button on the "Loader" tab of the in-game menu), you can put that file into a Character Folder (such as
Mods\Samus, or
Mods\$INIT$\). If you notice a
Dialogue.txt file or a
Code.txt file while browsing through your SDT folder, then you can probably put a
HueData.txt file in that same spot and it will have an effect on the game.
You might create a single
HueData.txt file which contains your preferred settings (e.g.
"I always want the shoulder tattoo to be green") and dump it into your $INIT$ folder ... or you can setup individualized
HueData.txt files (e.g.
"Asuka shall have a red tattoo while Rei will have a blue tattoo") and place each one into the corresponding Character Folder.
Note: I apologize if this post comes across as patronizing. You already know most of this stuff and you certainly don't need a link to the moreClothing mod. I'm just trying to offer a "complete" writeup for the sake of any newcomers who discover this thread in the future.