I finished my initial mod. It can be found on the Nexus.
MHW Female Birthday Suit
Hope you guys find it more to your liking. I'm going to play a bit with my friend, then I'll be back and describe the process a bit. I linked the tutorial I found in my mod description, so you can read that. But it wasn't an easy process so I'll answer what questions I can.
Edit: Alright, so basically I followed the tutorial found here:
[Tutorial] How to import/export BM, NM (BC1, BC5U, BC7) textures - General Monster Hunter: World Discussion - The Nexus Forums
And to extract the texture I needed the program Rawtex, found here:
XeNTaX • View topic - Raw texture previewer/converter
But you need to register for that site to download it. Then you extract the texture in size 1024, and compression method BC7. It will still look all screwed up in Photoshop unless you have the Intel Texture Works Plugin installed:
Intel® Texture Works Plugin for Photoshop* by GameTechDev
I don't think you can edit these with Gimp or any other program other than Photoshop right now, but I'm not sure.
Once you do all of that, you can edit the texture. Now here's where it gets really tricky. To get the texture back in the game you have to save it as a DDS file, using the BC7 compression. Then drag that texture file on the Texture converter from Nexus:
Texture Converter
But it's still not ready yet. You have to actually HexEdit the file. I used a free Hex editor called HxD Hex Editor. First you have to open the original .tex file. And the first 17 lines you have to copy. Down through line 00000100. Then open your new .tex file, and from there, you pretty much have to guess. I had to go down and highlight from the top, down to line 00000140 and replace all of it, with the original .tex file lines. And then you can put the .tex file in the game directory...
See? Clear as mud.