Okay, great to see that this works! So... to follow step by step. I have to:
1) Export my save file.
2) Change my skin tone
3) Change my mother's skin tone
4) Import the fashion block
5) Save edits
6) Import the edited save file.
Is this exactly what you did? Because I did this exact process and I do seem to have that weird error still. My mother's skin tone changes, I have all of the clothing, but my trainer in the over world is still in the default clothing (and I can't change my clothing/hair/eyes in-game to fix this either, so I'm stuck looking like the default trainer).