Also food for thought
“But the question is: is it BETTER to wear a bra? To this end, Jean-Denis Rouillon (and someone who I believe is associated with him, Laetitia Pierrot) has been looking at a lot of boobs. For science. Like you do.
I’m not sure whether the original investigation was all about boob sag or back pain and bra wearing (various media coverage includes both, but again, there’s no paper, so I can’t be sure), but the preliminary data so far has followed 320 women, ages 18-35, some of whom went braless for a year. During this time, they had their breasts measured with calipers, and Rouillon’s preliminary reports report an average INCREASE in perk by 7mm in the braless women.”
http://scicurious.scientopia.org/2013/05/10/friday-weird-science-are-boobs-better-braless/
From older national Geographic magazine evidence, this study is ridiculous. You cannot defy gravity.