My pick was as the majority: voice. Although I dithered between that one and facial hair. Having been on testo for a considerable amount of time, I sometimes don't pass as my birth sex now in detransition.
I'd like to think that after a very close shave and neatly applied makeup, and wearing my breast forms in feminine attire, I'd pass just fine as a woman, as long as I kept my mouth shut. My voice settled at a baritone pitch several years ago, and in other words that's in the lower end of average for an adult male. I like still it, but it's far from feminine. So I don't want to change it even if it gives me off. I'd rather then just explain my situation to people than change something about my body that I'm actually fond of. However, when talking I do get weird looks. Okay I do get weird looks anyway, so maybe my makeup and beard coverage just isn't as neat as I'd like to think...
It doesn't show up in photos, and irl I can only see it if I'm really up close to a mirror. However my mom has inpolitely pointed out that my makeup "doesn't hide it at all" to which I snappily replied "yeah but what else should I do then?" and sighed. I do grow a lot of very dense and dark facial hair. And as others have said here already, shaving close is tricky in some areas. I've got a nose and a mouth inconveniently in the way of the razor. It also doesn't help when you have a lot of acne scarring and raised bumps that get nicked from shaving no matter how you go about it. And dents where the razor simply can't reach. When I used to have my beard grown out in my transition, that caused a lot of acne breakouts which scarred my face, so now I have to suffer the consequences of... let's just sum it up as too many bad decisions.
Otherwise, I'd say if it wasn't for just those two things I'd pass just fine. I'm not sure if my having no breasts would raise suspicions though, in and of itself. It doesn't look naturally flat. Like the scars do reveal there once used to be breasts there. But it's rare that I show it to people anyway. And when I do it's only in very intimate, private settings, in which they already know my story. Most women don't tend to show their bare chests in public anyhow. But then the good thing about that is... for those people in those settings I don't need to try to pass as a woman; they know I'm a woman. That is so reversed to how it was when I lived as a man.
