I am going to go and ask my GF to change her outfit.
Why do you want to ask her to change her outfit?
I have seen the outfit that she has on and I am not a fan.
I hear you, but it you should not force fashion choices on your partner. It's her decision and you should let her make it on her own. Otherwise you will be seen as forcing and dictatorial, which nobody likes.
JUST ONE TIME I ASKED HER TO LEAVE OFF THE STUPID FUR COAT AND SHE MAD. HOW IS THAT DICTATORIAL?
If you constantly boss your partner around then odds are she will end up leaving you at one point. She will feel like she has no freedom, and this will cause her to just find a partner who gives her that freedom. You may want to consider just allowing your partner to dress how she prefers.