Since the only reason I ever was a vegan was the fact of ethical treatment and factory farming my answer is yes you should continue to keep and treasure and wear them. In fact, using every piece of the animal is a good way to ensure it didn't die for nothing at least.. To me wasting an animal's life that was taken for our consumption is more insulting and thereby worse than say wearing leather. And many animal hides can or are harvested from naturally deceased animals, making those a great option for anyone concerned about the well being of the animals whose skins/products they use. Factory farming and unethical treatment of animals was what led me over to finding out more about this topic.