Nike Ad Women Sport Clothes
I think as long as someone is fulfilling the minimum requirements of Hijab as per Quran, the rest is a matter of more piety. We should not try to put everything in Haram and Halal category which has not been explicitly done by Allah Himself. In my humble opinion tight clothing might not help in fulfilling the وَ یَحْفَظْنَ فُرُوْجَھُنَّ requirement in its essence.