When I was young 13 maybe ( I looked 10) I was sent to the principal’s office over a shirt I was wearing that was deemed inappropriate by my teacher.
( The shirt was a small eyelet, full coverage mid chest to hip )
I told the vice principal I didnt understand & that I had borrowed the shirt from my best friend who often wore it to school.
Also I considered her to be more mature than I physically so I was stymied.

He proceeded to explain to me that it wasnt the size of your breast that caused the problem but the shape.He further expounded on the exact attributes of mine.
The whole time he was talking I was intuitively put off, uncomfortable but didnt know why.