What is the ruling on one who performs 'Umrah while wearing sewn clothing?

Question:
A man says: I performed 'Umrah and circumambulated the Ka'bah, then prayed behind the Maqam, and then I realized that I had forgotten to remove my trousers and had not taken them off when entering the state of ihram. I knew that sewn clothing is among the prohibitions of ihram, but I did not remove them. I continued my 'Umrah, performed sa'y, then shaved my head, and then exited the state of ihram. What is required of me?

Answer:
If he was unaware that he was wearing the trousers and did not notice, and remained unaware until he had completed the 'Umrah, then he owes nothing. His 'Umrah is valid, and he owes no fidyah (ransom payment) because he was unaware. However, if he remembered during the state of ihram that he was wearing trousers, then if he removed them immediately, he owes nothing. But if he kept them on after knowing the ruling and that it is not permissible, then he owes a fidyah. This is fasting for three days, or feeding six poor people, each poor person receiving half a sa' (a dry measure of about 3 kg), or slaughtering a sheep to be distributed to the poor in Makkah. It must be noted that if a person does not have other clothing and needs the trousers, he wears them and owes nothing. If he has no izar (waist cloth) and has nothing with him but the trousers, he wears the trousers and owes nothing, because the Prophet (peace and blessings be upon him) granted a dispensation to one who does not find an izar to wear trousers.