I'm not sure I understand your question, but it seems you are asking why Jewish people who live in Europe, the Middle East, or Africa, all DRESS differently?
The historical roots are a historical connection with Abraham, and the "Chosen People" of the Old Testament.
Dress is not always a part of religion. People of different religions, often blend into the cultural dress of where they live.
If you were a Christian, you could live anywhere in the world, and if you lived in India, you'd dress in Indian-like clothing.
In South America, you'd wear they styles of clothing.
The Jewish religion does have some food taboos, such as not eating pork. So, no matter where they lived, they may hone that tradition.
Also, the Jewish religion has several forms, including the Orthdox, Reformed Jews, and another type (sorry forget it not). Some of the Othodox do not shave their hair, Reformed Jews may, for example.
The different forms of Judaism each have different Biblical Laws that they continue to believe as most important to follow. Just like there are several different Christian brances, each one picks and chooses what is important in their Bible to follow, or believe.
Ultimately, we all must use our conscience, and free-will that God gave us to best make use of our environment and learnings for His/Her purposes.