Sat sri akal everyone!

I have a question that has been bothering me for quite a while.
Why do these white sikhs in the us, but also in europe wear white clothes and white turbans? Has it something to do with kundalini yoga, cause I´ve seen them wearing white too.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sects-groups-cults/20441-white-sikhs-white-clothes.html

Beyond that... another question. Why do people who converted to sikhism wear punjabi-style clothes? I mean isn´t it enough to just wear a turban?
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=20441
I suspect that this outfit (I don´t know what they´re called in punjabi) is more a cultural indian thing and doesn´t necessarely have something to do with sikhi.

 
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