When I was in the sixth grade, about 11 yrs. old, some boys on the bus use to unhook bras from the back as sort of a joke. I always kept to myself and read, so when one wise guy went to unhook mine clandestinely, I wasn't aware of it, until he remarked incredulously, "she's not wearing one!" I realized that I was the only girl not wearing one and I was ashamed. After that, I started wearing a bra always, just in case!