What is the purple baggy fabric he wears? what is the purpose? why does he wear it?
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Are you asking about Sasuke Uchiha from Naruto? The existing answer assumes you are, but you've tagged the question with a completely different anime. Either way, could you please provide an image to illustrate what you mean? – F1Krazy Oct 20 '20 at 12:16
I think you are talking about this belt.
This is just a rope that Sasuke uses to hold his sword, but it also serves as an ornament for his clothes.
Here is an image showing the belt holding the sheath.
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3actually i think the asker is referring to what the belt is wrapped around – Memor-X Oct 20 '20 at 6:11
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3Considering that OP has tagged the question with an anime completely unrelated to Naruto, I'm not even 100% certain that this is the Sasuke they're asking about (it's likely, but you never know). I've left a comment asking them to clarify. – F1Krazy Oct 20 '20 at 12:17