Ruling on wearing trousers and a suit and tie

What is the ruling on wearing trousers if they are tight and stick to one’s body, or if they are baggy in order to imitate the westerners, what if a person wears a different style from what the westerners wear? 
What is the ruling on wearing suit and tie and other clothes usually used by the unbelievers? Is it acceptable because it became of Muslims’ habits and that an average Muslim will not think that they are worn to resemble the unbelievers? What should a Muslim wear nowadays?.

Praise be to Allaah.

The basic principle with regard to clothes is that they are permissible, except those which Islam has definitely excluded, such as gold and silk for men, except in the case of scabies and the like.  Wearing trousers is not something that is unique to the kuffaar, but wearing tight trousers which show the shape of the body, even the ‘awrah, is not permissible. Loose pants are permissible, unless the wearer intends to resemble those of the kuffaar who wear them. The same applies to wearing a suit and tie. These are not garments that are unique to the kuffaar, so they are permissible, unless the wearer intends to imitate them.  

To sum up, the basic principle with regard to clothes is that they are permissible, unless there is shar’i evidence to show that they are not allowed, as stated above. 

And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions. End quote. 

Standing Committee for Academic Research and Issuing Fatwas 

Shaykh ‘Abd al-Azeez ibn ‘Abd-Allaah ibn Baaz, Shaykh ‘Abd al-Razzaaq al-‘Afeefi, Shaykh ‘Abd-Allaah ibn Ghadyaan, Shaykh ‘Abd-Allaah ibn Qa’ood.