Yeah I tried that as well. I renamed them SceneA, SceneB etc. in case it didn't like spaces or numbers. But it doesn't change anything.
I think it's related to the folder names. If I keep the default character folder names, my custom images will appear. But as soon as I add my own additional 1s and 0s it no longer recognises the folders. Therefore, no images or options to strip/progress.
This is why I wondered earlier on if there's something encoded in the game that doesn't let you choose how many rounds (pieces of clothing) you can use.
When you create your custom characters, do you also change the folder names, or do you just use the existing folders on default characters and dump your assets in them?