Passing as a girl is FAR FAR AWAY for most sissies. In fact, for most every TGirl, passing isn't really on option....oh well, who cares?
But .... for you prissy little sissy girls, apealing to your Dom/Domme is VERY important. you MUST develope a more feminine stride if you are going to be the best sissy you can be. There are many great sites to help with this - so find a few and get to practicing. In the mean time, here is a cute short (non sexual) video with a little 'easy to follow' instruction.
From where I sit, the single biggest mistake sissies make is having too long a stride. Shorten it to 30" (max) from toe to toe and you will instantly get better at following this vid. I love you sissy.
Let's not forget one with tan-lines!!