mw13, it wasn’t that they had different names, language, and clothing – it was that they didn’t change it.
Chassidish levush comes from the dress of the nobles in Europe. Hats and jackets also were adapted from recent culture (although I’m not sure exactly where). Language? Yiddish was adapted mostly from German, with other European languages thrown in. Definitely not Jewish in origin. Names are the only thing that remained mostly the same – and even some names are taken from other sources. The name Gittel comes from German for “good”. I recently heard from someone named Shira who was told by R’ Chaim Kanievsky to switch her name to Sarah, as Shira is not really a Jewish name – it’s just a Hebrew word that people decided to use as a name. Many names we use now have no basis in Judaism.