Is Salaat performed with western dress permissible?

Answer

Western dress is not permissible at any time. Muslims have to wear an Islamic dress. It is not permissible to emulate the dress-styles and ways of the kuffaar. The abomination of wearing kuffaar dress whilst performing Salaat is an aggravated factor of prohibition. Whilst it is Makrooh Tahreemi (repulsive and prohibited) to be clad in kuffaar attire during Salaat, the Salaat will be valid, if the ugly pants are not so tight as to reveal the shape of the aurah. If the ugly trousers reveals the shape of the aurah, the Salaat will not be valid.