Before full time I did a few years of working retail while wearing women's clothing.
Women's jeans are the easiest. Just don't get to much bling, or too low a rise. You can also wear women's t-shirts, sneakers, and sweaters. You could also try earrings(hoops or studs), and a black a black purse.
I could go out completely in women's clothing, with no one the wiser. As I got bolder, I started painting my nails, using lip gloss, and adding jewellery. Still, no one said a word, but they must have started noticing something.
Just before going full time. I was at a wedding, wearing black ballet flats, dress pants, a black transparent shirt with a cami underneath, and my diamond wedding set. In the receiving line the bride looked me over (long time friend that did not know about my gender issues), and said 'You look pretty'. I guess you can go too far.