Hiya, welcome!
There is nothing quite so contentious as the clothing uniforms that we have to wear - especially for us who feel we are neither of the two choices. There is the androgynous side where we can mix it up if we are somewhere between the two ends of the binary, but, what if we feel neither? In certain respects I feel like neither man nor woman, and yet for public decency, I have to put something on, so I do, and generally my femme side screams at me for the lack of cut, styling details, patterns and colours in the world of drab.
Personally, transition isn't possible to represent my female characteristics - so I'm left with man-drab.
Switching clothing for me would be interesting - affirming in one sense, but incapacitating in another, as it would represent to myself in no uncertain terms the reality of being trans. Whilst I haven't taken that step, yet, I can maintain a semblance of denial, which makes the man suit more manageable. If I took that step, it would also bring all of the other issues I have into sharp relief, and quite simply I'm in no position to be able to handle that psychologically.
My reality is such that I am triggered by the medical and dental professions, and have huge flashbacks with the accompanying panic attacks. My reality involves heavy sedation for any kind of treatment, and strong anti-anxiety drugs from the point of decision that treatment is required, until the treatment is complete. Elective surgery is out of the question, and emergency surgery generally makes my cPTSD worse.
You're in a privileged position, being invited alongside your partner in their journey, unfortunately it will proceed at a pace that they are comfortable with - from our side it can feel like a slippery slope, and a burden of expectation, when we believe the reality should be a relaxed exploration.
I'm not sure if that's written well, I'm having word problems at the moment (cPTSD) but just relax and enjoy. Support, yes, understand yes, encourage, yes by all means.
(Hugs)
Rowan