I partially agree, I think the most important thing for passing honestly is feeling comfortable in how you are dressed and just doing your own thing. If you are moving around nervously and cautiously people will notice you more than they would if you are just walking like its any other day. It's one of those things where if you act like you belong then no one will question anything. How I dress has not really changed that much through the years, but my body language and how confident I am while I dress has changed between night and day. Before I was terrified of doing something as simple as going to Nordstrom to shop and I would stick out because I was super concerned with whether people would clock me or not. I do feel that I was clocked more often than I am now.
Today, I have no issues going into any store or really doing any activity because I am not really that concerned with whether I am clocked or not. What I have noticed is far more people surprised that I was not born female than before. I think it boils down to feeling like you belong and modifying some mannerisms slightly. Those two things combined have had far more of an effect in allowing me to pass than anything else.
