aaryd621
For the same reason some people imagine that the dress style of 18th century Polish aristocracy is holy. just because some Jews adopted it back then. Interestingly, at that time it was considered ultra modern, yet, the same people who dress that way are loudly condemning today’s suits as being the gentile fashion of the age. Why hadn’t those Jews in the time of the Besht worn clothing a’la Rashi, or something that Rav Achoi Gaon would have considered Jewish dress in their own period?
It is simple, if you truly wish to dress like the Avos, get rid of the 7 layers of polyester, known under different Ukranian and Hungarian names, and wear a woolen robe. While at it, take off those boots or oversized slipons and get a sturdy pair of sandals, the kind that Rabi Yochanan HaSandler used to make and wear. Once thus transformed, come back and preach about heimishe clothing and Middle German with a lisp.