I can understand your anxiety but at 16 a person has been developing their identity for a few years. You have not said your age but having gone through the 1970s as a teen in Britain braless was so common to see, one look and looked away. In fact, having the breast lower down looks natural, bras make them look unnaturally high. Bigger breasts may move more when walking but that was natural too. When she is 18 you will have little say anyway, if 18 is classed as adult in America. I do have issues with wearing see through clothes though. It may be that your worries are causing her to overreact and thus it's a rebellion phase. Back in the 70s blouses and tops were made from more natural items such as cotton or wool and some wore a camisole under their outer clothes. However, nipples were still seen but again it was oh look and look away. It seems we are now coming to ditching bras again and I feel that is a good thing. Bras are not a natural garment and women for thousands of years have not needed them so why need them in last 100 years or so. I left school when I was 16, a few years before that 14 was the school leaving age and hence you worked as an adult. Thus, all I am trying to say that I really feel for you, but she is no longer a child she is almost an adult and thus parents need to try and speak to their children as adults when they get older, but it's very hard as parents still see them as young ones. What I can say is that hack her off now and it may take years to get back to a relationship with her again. On top of that I have read this week (10/2022) that going braless is trending in the world again and the feedback especially after lockdown when women ditched their bras by the boatload, they are not going back to wearing them again as they found they hate them, and they were far comfier without them to the extent of forgetting to put them on when they went out of the house and now as said have left them off. I really hope you came to some compromise with her and how she is now dealing with her feelings.
Treating them like broodmares instead, wow, such freedom, many equal
My little sister at the age of 12 developed large breast and she did not like to wear a bra at all But now she does I think When she was developing She was fidded for the wrong size.