Understanding him is definitely going to take time and compassion. So deep breathes and one little step/day at a time.
Think about it in another way…
Your 6’5″ hunky man is still the hunky man on the inside. His feminine side has always been there.
He’s just now having the courage to make the outside/visual match what is on the inside.
He may not be able to put it into words, hence action and change of dress is how he’s letting that out to try and express whats on the inside.