My experience of looking at female physical appearance because of working in fashion industry.
Again, from the start, I was not 100% sure and had a bit of doubt. I am not perfect and at times I make mistakes. I am happy to give my apology... 
I let you decide and would be fair for every party.
There's no need to backtrack on your assumption
I'm just curious how your experience working in the fashion industry gives you a critical eye on anyone who has reassigned their gender.
I used to work in a model agency and dealt with loads of body types, and how the slightest adjustment to their metabolism could alter their physiology. But I never mastered the art of detecting if they had switched gender. I'm impressed at your skills.