It just periodically pulls textures. Its hard to force it to pull a specific texture. The best way to do it that I have found is to swap back and forth between two armor sets one being the one you want to modify. This normally captures all the textures for me. The files you want can be in the DXT1 or DXT5 folders.
I did edit that dds myself, but it wasnt a big edit. I just removed all the textures for the yukata which effectively makes it dissapear. You can use a tool like GIMP to modify dds files if you the plug in. Just have to be sure that you save it as the proper format (DXT1 or DXT5 with generated mipmaps when you export them).
Gotcha, the contents of the DXT1 and 5 just go in the modded folder right? Assuming you I find the right ones. Also what is the most efficient way to check for texture? Can Gimp view the textures.