JustWrong2

I'm looking to use GIMP to add some extra colors on top of clothing from a clothing mod that I just downloaded and added to my game but I have no idea how to do so. Basically two questions: 1. I have GIMP and my clothing mod (added to game via a mod manager). Do I need anything else? 2. How do I put the clothing into GIMP? I'm trying to find them in files using GIMP but I can't find them. I only found this guide below on how to recolor and how to save the recolored cloth but it doesn't tell me how to put the clothing into GIMP. https://wiki.nexusmods.com/index.php/Recolouring_an_armour#:~:text=Select%20the%20area%20you%20want,you%20prefer%20and%20click%20OK. Thanks in advance!