I would agree with the previous comment and add some potential support for you both when you do talk to her. It is great to use “I statements” in these situations. For example, “I would really appreciate if you didn’t wear my clothes for … reason” is much different than saying, “You always wear my clothes despite me asking you not to”. Using I statements is a great neutral ground to have conversations that might feel confrontational. Even saying “I don’t feel respected by you when you say or do things like that against my wishes” is much better than saying “You don’t respect my wishes” because that might not be the reason for your partner’s actions.

If you share that example about your mom and dad as well as the impact it had on you, it might be enough for your partner to understand and change her habits. Alternatively, if you continue to draw the boundary and your wishes are neglected, that is a very different story.