There is a certain specific dress code that you need to follow when you appear in examination centre and to know more about the dress code you have to refer to the official website.
But if you are asking about the customary dress code  (like Turban, burkha etc) then you'll have to wear that and report to the examination centre atleast 1hr before(please check the timing when you get your admit card) the entry time and if you opt no then you have to follow just the basic dress code.
Hope this helps
All the best.

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