I don't need to know whether somebody is CD or TS until it becomes an issue, and - again - I don't think anybody should be checking anybody's undercarriage at the bathroom door, nor do I think they should wear a name tag or a patch. I think they should carry a driver's license or state ID with their legal name and gender on it, just like everybody else does, and whatever it says defines what side of the law you're on if it becomes an issue.
Legal identity is legal identity, and it's the only standard that is necessary/should matter when it comes to issues of legality.