My girlfriend doesn't obey me. What should I do?

We've been together for a while. She's good, she never smokes, never goes to night clubs, never talks to other guys. I love her, but there's a problem: she wears crop tops all the time and that's not okay to me. I told her multiple times about it, but she always replied that she will never wear anything else.
My girlfriend doesn't obey me. What should I do?
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