To wear this Black Magic Mistress costume, first put on the dress. It's designed to fit comfortably, so just slip it on over your head. Then, wrap the belt around your waist and tie it to add a touch of style. Finally, drape the cape over your shoulders. When you're done using the costume, it's best to hang it up to keep its shape. If it gets dirty, check the care label for specific washing instructions. Generally, a gentle hand - wash in cold water should do the trick. Avoid using harsh chemicals or bleach as they might damage the fabric. Keep it in a cool, dry place when not in use to prevent any mildew or damage.