Health: I think it might be on the page of the S”A but I’m not positive. The Gra holds that any article of clothing that doesn’t serve an obvious purpose that the Goyim started wearing and Jews didn’t start wearing immediately becomes an Issur D’Oraisa of Chukas Hagoyim for a Jew to wear forever. The two major Nafka Minos of this Bizman Hazeh are ties and the Chassidishe garments (not that the Gra would have had a problem calling Chassidish garments Assur).
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