AAQ – that’s precisely my point; there’s no difference between sefardi-yeshiva dress and ashkenaz-yeshiva dress; if a community of sefardim decided that they’re all going to look like the ben ish chai, gezunterheit! We all took a certain mode of dress, the same way we took goyishe languages, and made it our own that we can always be recognizeable as Jews. Especially bnei torah, who the rambam exhorts to dress with even greater distinction. In poland, you were able to tell a yid a mile away…in some Litvishe yeshivos, they weren’t makpid on looking different, because they were so completely separate from goyim, spending their entire time in the beis medrash, that they barely even encountered a non-jew.
Especially in America, rav moshe writes that we need to look different; it may not be a halacha according to some, but it is a great tool, and those who dress goyishe usually are indistinguishable from their non jewish counterparts in many other ways aside from their dress.