mbachur:
could be i don’t know l’halacha but the gemara says a case where a tanna ripped off a goyishe girls shirt b/c it was untznius (he thought she was jewish) (I don’t remember where the gemara is)
Berachot 20a – It was a un-tsniut hat. And yes, he had to pay a hefty fine, 400 zuz.
But the Gemara mentions that as to why the earlier generations had miracles, because they were Moser Nefesh.