After I developed breasts, I pretty much wore an oversized hoodie to school every day, except when it was too warm, and even then, I wore one on marginally warm days. I learned this was a pretty good way to not display my growing breasts.
I preferred the pullovers, and would often wear them when not in school, but exclusively wore zipper hoodies to school. Sadly, this was because I learned the boys who groped me did not seem to twist my nipples and hurt me if I took off or unzipped my hoodie to give them access to my nipples and breasts.
I pretty much knew my abusers' schedules and they mine. I had learned the hard way if I tried to avoid them, I would get hurt.
I would always keep on my hoodie and keep it all zipped, except when I knew I was going to cross paths with one of my abusers. Then, before we would cross paths, I learned to take off my hoodie and tie it around my waist, so they saw me walking towards them, my breasts jiggling and my nipples poking out of a light, thin top. I found when I did this, they seemed to be gentler with my nipples and breasts. Of course, I had also learned to say the "magic" words, please pull my nipples if I wanted to avoid a painful twist. For any chance encounter, I learned to immediately unzip, Give them a nice view of my breasts and nipples under my thin top and ask them to please pull on my nips.
I learned to be submissive, and that they seemed to like my show of submission and pretty much no longer hurt me.