Same issue here, semi pro level. Really disappointed this hasn't been fixed yet and it's put me off playing my save which I was really enjoying. Been under review for months now...
We should be able to change our manager's appearance after starting a save. Some people may dislike their appearance or the way they look, and shirt/tie colours being locked often only benefits those doing a one-club save. Even if it is just the ability to change your apparel it would be a nice option. In last years FM tie colour changed automatically depending on your club so this isn't too much to ask for in my opinion.