I get what you are saying about blending. I've definitely dressed to blend for a long time (though now I'm more comfortable dressing up more, as evidenced by my last post in the picture forum).
But I'd characterize "blending" more as a strategy than a result. Dressing to blend IMO is literally *the* best way to give yourself a chance at passing. In my post I described the other CD'r at the mall on Sunday who was definitely not dressed to blend, and as a result was not passing.
So I'm inclined to stick with my original post, and to call walking past people with certain responses to be literal passing.
When talking about directly interacting with people I would have a whole other set of categories for reactions to use as a guide to evaluating whether you pass. LOL
That said, I can't remember the last time I got the wide-eyed look during a direct interaction. I still don't think I'm generally passing in those situations. Definitely much less than 50% of the time would I think I pass face to face.