If you are so deathly afraid of someone seeing you in your underwear, just wear your shorts and shirt under your regular clothes.
we got in trouble for that stuff too
got in trouble for half suits, too
you could only have gray and blue, no accents of anything whatsoever, only grey top, grey or blue bottoms
if u didn't dress as the standards for 2 days a semester u got like a referral or a bad grade or some stuff, idk