I know some pps have the attitude that men are out-of-control lustful beasts and that any suggestion that women should modify their clothing choices for any reason at all is out of the question.
That's not how I see it. To me, it's not a case of 'please consider male teachers who might be aroused/embarrassed/not know where to look'. To me, it's about aesthetics and what's appropriate. I don't like seeing erogenous zones of either sex on public display - call me old-fashioned, I really don't care! And oddly enough, it's not because I become helpless with lust on seeing a young man's ripped chest or a boy's butt crack above his trackies - I just find it off-putting and inappropriate.
I sing in a choir and our uniform is all black. The rule is: arms covered. Is that because we're scared the audience males might be driven to uncontrolled lust while listening to us sing? Er...no. It's because pretty much everyone in the choir agrees that large expanses of (especially white, which stands out)bare flesh is unappealing. There have been the occasional women who've worn very, very low-cut dresses, and it's not a good look in this context - for a start, it's attention-seeking. It's a context where the focus should be on the music and the performance, not your bulging buzzies. And - the point of a choir is to blend voices and also blend into a homogenous mass in appearance, not to stand out in a 'Look at me!' way.
It's not always about sexuality. It's about consideration for other people who might just now want to see you butt cheeks or breasts bursting out of clothing. I don't know why this is so hard to understand for some people. It's as if they think everyone goes around in a sexual frenzy. They really don't. It's aesthetics, aesthetics, aesthetics.
One eg. I've been in situations (when I was younger and prettier) where men have 'paraded' themselves in a state of what they obviously thought was irresistibly sexy (budgie smugglers, thongs etc). I was just embarrassed myself, and for them, and ran away pdq.
Just a different perspective.