Gosh that's a super hard thing to define. It's so subjective and it totally depends on the CDer. Like Cindy said:
Let me say this to you. When you are driving along and you see a person on the sidewalk walking in the same direction as you, with their back to you, you can almost immediately tell what gender they are cant you? How do you know what sex they are? ... it's because of so many things ... their body size, their clothing, their hair length, their general bodily movements, it's a combination of all of these things that happens in a micro second that tells you instinctively what gender that person is. Passing is the same .... just because you have long hair, boobs and you are wearing womens clothes doesn't mean a thing. It's all those sub-conscious signals that you are giving off that indicate male or female. Passing is almost a science! .... it's a very difficult thing to achieve and there is no easy way to quantify it. :2c: