You say that Salaat should not be performed while dressed in the new kind of pyjamas.

Answer

(The brother had sent a picture of a new style pyjamas.) The flowing gown of a Roman Catholic priest is 'beautifully' large and spacious. It covers the body more than adequate. It is very loose-fitting thus concealing the shape of the satr. It is long, covers enough and is loose enough. Will it be permissible for a Muslim to don the kaafir priest's garment for Salaat and for wear in the home? The garb which Christian nuns wear covers more than enough of a woman's body. The nun's garb is loose enough and covers enough, and in fact is more modest and respectable than the rubbish designer, immoral abayas which Muslim women wear in public to attract the immoral gazes of men. Will it be permissible for Muslim women to wear a nun's garb? It is loose enough and covers enough. From this, you should be able to understand why the pyjamas are not permissible.