Another thing about shoe size, HRT can't change your foot bones, I'm not on it yet, but my feet went down a size just from losing weight, being heavy causes swelling in the feet, still got another size and a half if I want to fit into department store women's shoes, but here's holding out hope that losing another 35 pounds and HRT combined can make it happen. Probably not though... Destined to be one size bigger than I can buy in most stores I think, kinda depressing.
Oh, HRT can't change bones, but all manner of soft tissue is fair game, you might get a half size difference if you're lucky!