I was on the second grade of elementary school, my age should have been around 8. In fact, we were having a school play, which would be played in front of the whole school later on, but the problem was my class was missing a girl. It should not be that hard to guess, who was the "victim". The choice well of course on me, the most feminine boy in the class.
So technically speaking my first time(the times I wore the cloth for "training" do not count) was in front of whole school, so around 1000 people or so. I was wearing red high heels, red dress and a nice long haired blond wig. Not to forget the filled bra to give some breasts to this little kitten.