One thing I'd also add is to work on makeup in a way even beyond serious. Now, that is not the same as putting on a lot! I'm saying to work with professionals, a lot, over and over again, to get a VERY, VERY natural look. And, I am saying makeup professionals, since drag queens intentionally get it mistoned and over the top (the opposite of what you want). A handful of girls here have done it with talented GGs, so I do say it is possible.
Foundation should be natural. Eyeshadow should be not over the top, and especially working with what you are wearing, your age, where you are at and even the time of day. Each element should be worked on with a tremendous amount of artistry and precision.
If anything I've seen to pull off passibility it has been this:
- Being slim, but not too slim for a woman of your stature
- Padding, if your body needs it
- Incredibly subtle and flattering makeup
- Eyebrows that look within the typical female maintained range (but not too thin, either.)
- Your own real hair, or human hair wigs, done in a very natural and 'normal' feminine style, that being a style to also lays shadow over your (naturally more prominent) jawline and brow ridge (if necessary).
- The clothing tips stated in this thread.
Anyway, please keep this thread going! I wish there were more like this!