Well, the kotor games use a body per armour type. So you would have a body for light-; medium- and heavy armour. Plus the female/ male form. Then in K1 you also have various hights of body. Depending on what class you picked at the start; soldier would be the beefiest then going slimmer for the other starter classes.
So, it all depends what you're looking for. Is it just the underwear model or one of the armours in the game you want to change.
But the tools needed:
- Kotor Tool ( extracting the models from the game)
- MDLops ( to compile said model files, so you can edit them in 3D software)
- NWmax+ Gmax or 3Ds Max (NWmax imports the model files; Gmax is used to change the shape of said model)
Last tool: Patience and determination.
Doing 3D work for the kotor games is a hard thing to do, not impossible, but be prepared for a lot of work and redoing stuff