Agreed that we can't necessarily make too much of the study I linked to there. But I also think the whole bras prevent sagging is also based on just anecdotal evidence.
Admittedly, I have my biases. I've always been one to prefer to go bra-less or to just use soft bras that offer no real support. I've always hated the underwires and other torture devices that bra makers have invented for larger sizes.
And also admittedly, I do sag. But at age 50, the sag is no more than it was when I was 15 years old. So while my breasts have never been beautiful, they actually haven't changed much in the decades that I've neglected to support them.
Of course, I am just a sample size of 1. But I have also seen the effects of always wearing a supportive bra on other women and the results are not always as pretty as the woman you cited in your earlier post. My guess is that genetics plus a whole bunch of factors go into breast shape, look, and eventual sagging.
Personally, I'm still committed to avoiding bras whenever and wherever possible. Am not saying that others should follow my example, as women are free to do whatever they want. I'm just offering a different perspective
ETA: This is a link to a blog post that makes some interesting points and argues that there is no real evidence supporting claims that wearing a bra prevents sagging: For the Last Time, "Tribal African Women" Are Not Proof That Bras Prevent Breast Sagging I The Lingerie Addict
Her article argued that we can't know if there is causation from bra wearing, but we also cannot know that there isn't. And true, it is possibly irrelevant to point to tribal women as examples, but I am also considering all the hippie chicks I know, and how their breasts seem to be holding up.
Gravity is what it is, and gravity is what causes any type of sagging. The tissues surrounding and holding the breasts up will be affected by gravity over time, and this is true not only for breasts but also for butts, testicles, and any other part of your body that can be pulled on by gravity. Our tissues and muscles and tendons are affected by age as we are also slowly affected by gravity, and thus most older women have some sag to their breasts, even if tiny breasts. Then of course pregnancy, weight gain, all the other things this article mentioned....totally true as well.
But I know if I have an orange hanging in a sock, over time that sock is going to give way to the weight of the orange. Ok, so breast tissue, tendons, muscles, etc. aren't socks. But they will still heed to gravity, no question about it. Gravity always wins. Now if I put the orange in a sock in a bra and hang the bra up, the sock will stretch out much slower or maybe none at all.
I can feel the weight of my breasts trying to pull them down. That's why the damn bras are so uncomfortable, by having to redistribute all that weight. But I'm thoroughly convinced wearing them has made a huge difference in my breasts compared to how they might have been. I'm too busty to go braless, and can't really go to work in most thin bras because nipples show through. Trust me, it is a pain in the ass to me...I don't like it at all (except I do love pretty bras, but most of mine are just utilities because they don't make that many well constructed ones that are pretty) (IMO Victoria's Secret's prettier bras are never well constructed). So I get your choice too, and perhaps there really is no difference.
At this point I'm old enough that I feel I've staved off gravity as well as I can and am really happy with my results...and I do find excuses to be braless or in a skimpy simple bra more and more often now.
I still don't like when my nipples show through anything I'm wearing when I'm in public though. Its just like wearing a sign around my neck or something. Not sure what the sign says but apparently "CHECK OUT MY CHEST!" or similar.