This seems pretty normal to me. I'm not a doctor or anything but as men age the testosterone levels tend to decrease which may allow us to more freely experience our feminine side maybe?
On the one hand you say you're not "ready for anything more yet" and yet you're dressing more and thinking about HRT, it sounds like you ARE ready for more but are afraid of what it means and where it might lead. Well if that is the case all I can tell you is don't panic. Just because you have these feelings doesn't mean you're going to run out and chop off your man-bits. These feelings can come and go. Sometimes it'll be stronger than others but it's all relatively normal.
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How is cis male "not a thing"? From time magazine:
Cisgender is a word that applies to the vast majority of people, describing a person who is not transgender. If a doctor announces, “It’s a girl!” in the delivery room based on the child’s body and that baby grows up to identify as a woman, that person is cisgender. Similarly, a baby designated male in the delivery room who grows up to identify as a man is cisgender. This is the case for about 99% of the population, at least according to the best available statistics...
In 2013, Oxford Dictionaries—the branch of Oxford that deals with modern usage, words we’re using now and how we use them—added cisgender to their ranks. Stephen Colbert joked in June that he is “cis-white,” because “I’ve always been comfortable with my birth race.” And in February, Facebook added no less than 10 “cis” terms among their expanded options for gender, ranging from plain cis to cis male to cis woman.