I have never been out, so you could take this with a grain of salt:
I would say that the more attractive you try to make yourself, the more looks you'll get from men and women and probably the harder it will be to pass or "blend." Even if your look is close to perfect, you will have had to master all aspects of female comportment... the way you walk, the way you sit, the way you eat, the way your body moves, etc.
How often do we stare at beautiful women for as long as we can without getting "caught" whilst giving an average girl only the once over? The beautiful CD, therefore has a much longer timeframe to be read by either sex.
Most GG's are not models, they're not movie stars, they're average. I think that in order to pass, it is necessary to have that "average" look and have a more than modest degree of feminine movement, and of course, voice.
I'm talking about CD's in general, not TS's who've had FFS, SRS, or those Miss Transgendered of the World candidates in Thailand!
Well, that's just my opinion.