Using commercial fabric with trademarked characters, or commercial charms, or whatever, is not the same thing as recreating someone's intellectual property (e.g., drawing my little pony). That is why there is some disagreement within the courts, and why you have dissenting opinions on the internet and elsewhere as to the legality of that use.
Saying that they are the same is as narrow-minded as saying that using trademarked fabric is absolutely fine, no worries - in truth, it's kind of a grayish area, and all the money (and thus most of the power) is on the side of the creators/owners of the characters, so fighting it is generally a bad idea, financially.
Similarly, suggesting that someone should call the company and ask if they're okay with commercial use is poor advice. I wouldn't call Ford Motors to ask if I can deliver pizzas with my car, or resell the car - the law says these things are okay, and Ford really has no say in the matter.
You would only call the company if the law says that it's *not* okay without permission and you want to ask for permission - but that is not the case here; the case is that the law is not settled.
Also, don't contact Etsy's legal team. They don't give legal advice regarding copyright/trademark law, and will not tell you whether or not you can sell something.
Finally, there are limits to intellectual property law (as there should be). You can't copyright or trademark the design for a t-shirt, or finished items made from sewing patterns (unless there is some original art involved).
All that said, I would not mess with licensed fabrics unless I had lots of $ and a good lawyer; not worth the trouble.
