Dear Anushka, 

You can wear legging with no pockets , zip and buttons but it is advisable that you wear something more comfortable and loose such as salwar or trousers. The leggings should not be too tight or of any dark colour. According to NTA.dress code policy , preferred clothes for female candidate are trousers with half sleeves top or  salwar paired with kurti. Make sure you are not wearing any kind of jewellery.

Good luck:)