The thing is, though, gaining weight doesn't usually mean creating new fat cells. Your bloodstream will deposit the excess energy wherever there is space, usually equally among the body's existing fat cells. So you'll basically just get more fat wherever you already have fat. And likewise, losing weight doesn't remove fat cells, it just deflates those same fat cells that are already there.
So if you gained weight, whatever breast tissue you did have would be inflated in proportion to everywhere else that your body has fat, and then when you lost the weight it would still be in proportion to everything.
The only solution to developing female curves is time. Because while gaining weight generally does not mean adding new fat cells to specific areas, Puberty, and therefore hormones, do indeed cause more fat cells to be created in certain gender-specific areas. But it takes time. And again, gaining or losing weight to put on curves is all about where existing fat cells already are. Those who already have more fat cells in their breasts and butt will put on curves disproportionately, while those who have more fat cells in their stomachs will just end up gaining stomach fat disproportionately to the rest of the body, and thus might actually make the female curves look even smaller. So just be patient. Because until those new fat cells are created, gaining or losing weight won't help you put on curves.
I'm saying this because I did try to use this strategy, trying to gain weight because I figured it would go to my butt and boobs now that I was on estrogen. It didn't. It went right back to my stomach, arms, and upper body, exactly where i was losing it from in the first place. And I didn't really gain any butt or boobs whatsoever. So again, give it time. I've continued to get a bigger chest, and a bigger butt, as time has gone on. But to be honest, my weight gain/loss really hasn't seemed to affect it whatsoever. It goes at its own pace.
