I recall when I was about 6 months into HRT, no serious development yet, and was still largely, "stealth". I was in a rest room, the Mens Room still, and was wearing a womans deep vee tee shirt. I washing my hands Ieaning forward over the sink and holding my arms tight against my sides. I happen to look up at myself in the mirror, and holy sh&t, I actually had, cleavage! The rest of the day I was walking on air :)