I think Jodi is right. Try just a band, not to tight. After a few times whitout her pulling on it you can add a bow. It takes some time, but she will get used to them. The harness dresses are great, thats a good way to make them dress up.
Princess loves to put dresses on. Poncho on the other hand, isn't too crazy about his sweaters, but he will wear them. Good Luck!