Is it permissible to wear loose trousers in prayer?

Question:
He asks: What is the ruling on wearing loose trousers, and what is the ruling on praying in them? If it is the custom of your country that men wear trousers, if it is the custom of your country...

Answer:
...that they wear trousers, then there is no harm, because the default ruling for clothing is permissibility. But if the custom of your country is that they wear thobes, or that they wear the izar and the rida, then you follow the custom of your country and do not go against the custom of your country, lest you become a source of notoriety among them.
Wear what the people of your country wear, as long as it is permissible and contains nothing that is forbidden.
Wear, wear like them, and pray in them; there is no harm, provided it is not tight. It should be loose so that you are able to bow, prostrate, and sit. It should be loose, not tight. Yes. The default ruling for clothing is permissibility, and one follows the custom in every country. Yes.