Here's an issue that I've run across. I don't know specifically how the content stores handle this issue, so it makes categorizing vendors somewhat problematic.

Here's a sample of what I'm talking about.

There's nothing wrong with this image except, I can't list Biscuits as a vendor for La Femme. As far as I can tell, she doesn't make hair specifically for that figure. And she doesn't seem to have a fit in the hair for that figure. Now granted, I know that hair can be resized and made to fit almost any figure, but by that logic any vendor can be listed as a vendor for La Femme if you use the Fitting Room.