I could color my hair red, blonde or black, but I'd still be nothing more than a brunette with colored hair.
THAT'S REALITY.
Obviously there are degrees of change and feeling. Some changes can elicit deep feelings of how one perceives oneself, other changes will be trivial and of no consequence.
I think what the difference of opinion is about, is the argument between the reality of chemistry and biology - namely that our DNA is immutable and that therefore we are also immutable as persons.
But there is also the school of psychological thought that feelings and perceptions of who we are, can change according to circumstances. And that these changes result in different feelings but also in different ways of interacting with people around us. And because others see only outward appearances and not our innate DNA, outward appearances will influence how others interact with us and we consequently with them.
It's very simple to understand that a person will be treated differently because of the manner of dress. Someone in a uniform of (dreaded) authority, will be treated differently by others and consequently also act differently towards others. Hence, for a period at least, they become different people.
On a personal level I know very well that when i used to work for a multinational and I put on my London tailored three piece striped suit and tie, I felt and acted differently towards people than when I was home in corduroy pants and a sweater. How much more different would that have been in a truly respected or feared uniform? Or had I dressed in a dress and blouse and high heels?
Granted the personality changes are temporary, but they are manifest to others nonetheless and to yourself as well if you are introspective and honest.
I think we've had similar conversations and differences of opinion on matters like transgendering or gender changing as well as how languages change and evolve.
I really love these kind of exchanges. Makes me feel young again and back in high school among the Jesuits ... 😃 😃