Tbf I thought this was a joke I post.
you chose to date her and probably fell for her looks whilst wearing these clothes, you can’t expect her to change now you have her. She is not your possession in which you can tell her how to act, dress or think now that she is in a relationship with you. She is her own person an should remain so doing what she wants to do and living how she sees fit.
I think if you did give her your little speech it is more likely to highlight a bunch of red flags in her that may well Make her dump you faster than diahorrea if she has an sense.
also by ending it with the fact you know she will be your wife because you love her so much sounds creepy, manipulative and ver possessive.
I suggest that you look upon yourself and your own insecurities as to why you would need to tell your partner how to dress especially when she has never cheated before. If you can’t trust your partner you should not be with her. It’s not only detrimental For your own mental Health but hers as well.