As I understand it (an I may be wrong here) transgender is the movement of gender so you are transgender only when you are in flux. Once you have arrived in your preferred gender you are no longer transgender so would normally be described solely by your new gender but may for reasons of clarity be referred to as transgendered (like I needed to above).

Audrey & Sophie are women. A transgendered man was,usually, once, physically, a woman. A transgendered woman was, usually, once, physically, a man.

I say 'usually' because as society becomes more open about this stuff it is becoming increasingly clear that gender is a sliding scale, not a binary state. A surprisingly large percentage of the population people are born somewhere on the scale between male and female physically (and/or mentally).

Hopefully we'll just get over gender. It's essentially an unhelpful social construct that is too rigid for nature.