My understanding of the international standard of care for prescribing hormones for the purpose of transitioning is the patient must already be presenting as the chosen gender in everyday life.
So for a MTF, surely that doesn't have to mean presenting in stereotypical feminine styles does it? As in skirts and dreses. That to me would be a bit sexist, as cis woman can be seen in any number of styles.
The idea of forcing a patient to dress in women's clothes before their external body is ready is a form of torture, not care. More like feeding you to the lions (general society). I know it's to make sure people are genuine about wanting to transition, but it's a huge obstacle and unnecessary stress for many who just cannot pass yet.