As I see it: a person who's "out" about being gay isn't necessarily going to wear a "hey everybody I'm gay!" t-shirt all the time. (Maybe on occasion.) They are going to be honest if asked, and will tell some proportion of family, friends, coworkers and/or the general public.
Someone who's transitioning genders is very likely to come out at some point... at which time, they pretty much are advertising their "new" gender.
What's it mean for an androgyne to be out though, when society generally recognizes exactly two genders?
I've told family and some of my friends, I've posted it on Facebook though I think it went mostly unnoticed. I sometimes wear womens' shirts but always the button-down business-y style so it's pretty subtle. I'm not likely to go far beyond that in my presentation. Anyone who sees me out of the blue is going to think "male." Most of the people I interact with on a daily basis think "male." Some of the others think "male, but kind of also female-ish under the surface." If someone calls me "sir" I not only don't correct them, but I'm not bothered. I continue to use the masculine name my parents gave me. Does this mean I am out, or not?