Witches are not interested in power. We are interested in attuning ourselves with Nature, the God, and the Goddess in hopes of leading a more peaceful and fullfilling life. Since Witches do not believe in Satan or the Devil, it is a contradiction to say that is where we get our power. We have just learned how to harness it for the benefit of ourselves and mankind so long as it harms none. All witches wear black, look gothic, use heavy makeup and jewelry and can be spotted a mile away.
Some witches wear heavy makeup.
Some witches wear jewelry. Chances are, you have come in contact with a real Witch at least once in your life and never even knew it. Because the vast majority of Witches don't advertise their religious choices in dress. Religion is a very personal thing and to avoid stereotypes and harrassment, modern Witches are virtually undetectable. They dress just like you do.