@Nutsis thanks for the update. I'm pleased to hear that you were able to unlock the trophy and that you received the correct cutscene.
I'm sorry that the outfit has not been unlocked on your main save.
I have checked for an update on the issue as it was reported to the development team previously and after thorough investigation they have confirmed that they are unable to continue looking into a potential fix for this particular issue as they must focus on issues that have a comparatively higher impact on the gameplay experience.
I understand that this is not the outcome you were hoping for and can only apologise.