As stated, many things can cause hormonal shifts, and some people, likely all of us here given the shifts our body's have gone through, are more pre disposed to estrogen dominance than others who's body's may combat it more actively rather than welcome it warmly. Breast tissue is one of the most easily triggered tissues to grow in the body I've learned and once it's present, even subtle and steady exposures to estrogen rather internally or externally can cause growth to occur.
For those here who have established breast tissue, it's likely that supplements, medications, dietary habits, etc can provoke further growth to occur, and probably why some of us see no difference in some areas of our body's but still see our breasts growing. And others notice their body's changing dramatically over the years and may not see much growth in the breasts department. Body's are fascinating and the reactions to things are equally so.
@42C , i remember those days, I was one of those people pushing back lol. I believe it was actually you or someone else I spoke with directly at that time to better understand the why behind the drive of conversation being womens attire. Reading it as someone who isn't tuned in to it can absolutely deter someone here to learn, grow, adapt, accept etc log off and go this isn't the forum for me. But talking to people is how we understand the why rather than dismissing with judgment. And shortly after talking with I believe you, I better understood and didn't feel so why the heck are we talking about this here. And actually took the advice given to try some items and had to agree, they fit better. Which the whole explanation and argument was about fit, not crossdressing or men trying to be feminine. Just comfort. Trying it myself, provided a reality I didn't know was one because of my own ignorance toward the topic. Now, all my jeans, dress pants, tank tops, dress shirts and casual shoes are from the womens dept. Unisex in design and cuts but women's nonetheless because my body changed and as a result my clothing changed to acommodate it. Nothing more or less.
Same with those who are looking to enlarge their breasts. For those weary of the direction this may go in conversation here, i stress the importance in understanding many here have been here for many years. With time, experience, education and evolution of self, expression of self changes as well. Perhaps this is a nose ring or tattoo, maybe it's adjusting clothing selections to accomodate fit, maybe it's actively enlarging your already current bust size as a man. To each their own. It's not my cup of tea, but if it's what one wants to do they should be welcomed to talk about it long as it doesn't cross any inappropraite lines.