What would you do? Would you go out and talk to your friends, co-workers, go out in public, etc? By "passing", I mean that you look nothing like your male self, you look like a GG and your voice sounds like a GG and even your SO (if you have one, or your best friend) couldn't recognize you.
I'd go out to a clothing store, ask for help first in a femme voice, and when something didn't fit and I would say in the lowest voice possible "This doesn't fit, do you have one in another size?" and see what kind of reaction I could get.