There is no specific length. However he must not imitate woman or kafir!

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No, this is not what was intended by the hadeeth! If a person wears a weird colored clothes or ride a really weird car that he becomes famous and people point at him due to that, whether due to its value or cheapness, this is part of seeking fame with it!

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This is permissible though it is not recommended as it can be a bit feminist.

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