Many schools and workplace mandate that girls and women must wear a bra. This is a rule that is more and more being deemed discriminatory, because it only applies to one gender and wearing underwear is a personal decision.
If you say that women need to wear a bras due to breast size, then there are plenty of men that should be wearing a bra.
If you say it’s about seeing nipples under the clothes, than management should mandate that all employees must wear a tank top under their tops, then it’s not gender discrimination as it applies to everyone.
Teachers and employers should never points out the fact that you need a bra.
Personally, I believe demanding to wear a bra should not be happening. Everyone’s comfort matters, and some times it’s about health reasons. People have there reasons, and should be allowed with out the need to defend every little thing!