Wenke, I was trying to do something totally different than what you show in your screenshots.  I was loading the .cr2 file for the dress, and then browsing for the texture and clicking the "apply" buttons and then "save as" and overwriting the .pz2 file that was there.

When I applied the texture, the texture applied properly and showed properly in the pose window, however upon rendering the dress rendered in the default green still.

I'll try what you show... direct resaving, and see how I do with that. If this doesn't work, I'm done fussing with it.  I've been fiddling with this for over 6 hours now and am a hair away from uninstalling the dress and forgetting about it.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi