” simply more or less the same garb Jews wore 200 and more years ago”
Only in one part of the world.
“Jews have always dressed differently than non-Jews. “
The Israel Museum in Jerusalem has an ethnography exhibit that proves that that is not true. For most of history we have dressed pretty similarly to non-Jews in the same geographic area. (One of my favorite examples, that I have often mentioned, is the adoption by Jews for the Fedora hat!) In recent times, frum Jews have consciously dressed more modestly than non-Jews but that wasn’t really necessary until the 20th century.