Umm Ayyoob said:
‘This question was put to the Shaykh: Is it permissible for the woman to pray in tight fitted clothing?
The Shaykh -Rahimullaah- answered saying:
‘If the intent by the word ‘permissible’ you mean is the prayer accepted? Then apparently the prayer is accepted. And if the intent of the word ‘permissible’ you mean that it is no problem for her to pray like that, then that is a problem, because as you know that from the conditions of dress by which one must cover the ‘Awraah (the private area) regarding a man let alone women that it should not show the size of the ‘Awraah.
However, we do not have any evidence to say that prayer in this condition is invalid. But there is no doubt that with the second meaning that it would be okay for her to pray wearing tight fitted clothing, then this is not allowed, as for the prayer then it is accepted.’
Then the Shaykh -Rahimullaah- added by saying:
‘It is necessary that she wears above her clothing the like of an ‘Abayyaa, wrapping sheet worn for prayer and things similar to that.’
[‘Various women’s issues from the Fiqh of ‘Allaama al-Albani –Rahimullaah’ – compiled by Umm Ayyoob p.59]