I gradually transitioned from presenting male to female. Growing up, I always had to try to be a boy/man, it was an act. Once I figured things out, and began HRT I began presenting female in safe places. Then I began presenting female in public along with friends. Over time HRT effects were happening and I became more comfortable letting go of my old act. I continued to come out to more and more people, and presenting in more and more places and situations.
I told my entire family, all of my friends, and my place of work. I've tossed out my old clothes not because they're "male," but because they don't fit in the but anymore! I've still got some of my old T-shirts, but my style is much different, though not very different. (I work at an urban farm so simple casual clothing is what I wear unless I'm on a date or fancy occasion)
There was a time when I decided I would never again pretend to be a guy. At the time i was already out to my family, and friends. My girlfriend's father didn't know and she was trying to make me pretend to be male whenever he was around. I understood her anxiety, after all, I had told my parents already, but I put my foot down. That was full-time for me. I also came out at work at that time, something I had been putting off since I was in a somewhat temporary job.
I think being full time means 100%. Never ever pretending to be a guy again. I know many cis women who never wear dresses. I do wear dresses for fancy occasions or when I'm not at work... like wearing a summer dress on the weekend/evening, but it's not what you wear, it's how you wear it... I can rock flannel with jeans and still present female.