How would I incorporate this into my Daz 3D library?
First do as you normally would
a) load the clothing into the scene
b) select the clothing
c) apply one of the available presets (in this case probably the pink Spirit version)
Second, with clothing still selected
1) go to the surfaces tab
2) select the clothing (in the surfaces)
3) find the "Base Color" and click on the texture icon on its left edge
4) Select "Browse..." from the popup menu
5) A file selection dialog will pop up. Navigate it to wherever you chose to save the new BaDIK texture and select it
You're done.
Applying the Spirit textures first set up the material with all the original settings, bump map, normal map, etc, etc.
If you want at this point you can do a "File -> Save As -> Material Preset..." That will create a new item in your Content Library with the currently applied textures and settings (item will be created in the "My Library" portion of the content library).
Creating a preset isn't necessary. The scene you are working in will work with or without. Just depends if you want the preset for slightly quicker future use.
I will add, when you save scenes in Daz it does not save things like textures. If it did save files would get huge fast and waste a lot of disk space. Instead it saves which textures it needs and loads them from where they already are saved on disk when you load a scene. I mention this because wherever the new texture is stored on your computer when you use the file browser mentioned above to select it is where Daz will continue to look for it and load it in the future (if you save and later load a scene that uses it). So you probably do not want to just drop the texture onto your desktop or something like that. Doesn't really matter where you store it (I often will store edited images in the same directory as the original images I modify, "...../runtime/texture/outoftouch/..." in this case, but it can be stored anywhere), you just can't move or delete the texture after you used it. If you delete or move the image, then when you load a scene that uses it you'll get a message about a missing texture. Everything else will load fine. Then you can either just continue without any texture, or you can click back on the "Base Color" icon and do the browse option again to choose a texture again.