People started called me my new name when it was official and I was wearing female clothes and faked breasts, simply.
And eh, just stop trying. That's the best advice I can give you. Two years before transitioning, since I had to wait after the psychiatrist, and then HRT, anyway, I decided I didn't want to endure the unhappiness of having to pretend anymore. So I started buying only female socks, mittens, scarves, hats, jeans, shoes and sweaters, only leaving the t-shirt male because female tops are just so unmistakably female.
People didn't see me as a real man at all, a few accidentally she'd me, a couple of strangers whispered about me, but most of all, I was happier. Happier not to have to hold back too much anymore, and actually happier to be viewed as a not-a-real-guy, or a doubtful-gender person, than as a guy. Nothing hurts more than being seen as a guy and having your actions be expected to be those of a guy.
And honestly, however awkward a gender combination you may appear to be, if you're yourself and more comfortable, people will be more comfortable towards you and interact with you more. True and tried.