i am suing my ex in court for my clothes. She was in Hawaii. She has re-located to Oklahoma. Can I sue her in both states?

You may be able to sue her in either state, but not both at the same time.  Given that the tort she committed (coversion of your property, i.e. your clothes) was committed in Hawaii, Hawaii would probably have jurisdiction over her, so you could sue her in Hawaii.  However, small claims courts are usually  courts of limited jurisdiciton, so you might have to sue her in a court of general jurisdiciton, where the court costs are generally higher and the wait times generally longer.  Moreover, even if you win in Hawaii, you're still going to hasve to try to enforce the judgment (which may be a default judgment, making it harder) in Oklahoma.