A pilgrim forgot to shave or cut his hair and so he performed Tawaf and Sa`y and put on his Makhit before shaving or cutting his hair

Q 3: A man came to Jeddah and on the next day he went to perform the first `Umrah (lesser pilgrimage) in his life. He went with a relative and performed the `Umrah. After we finished the Sa`y (going between Safa and Marwah during Hajj and `Umrah) I said to him, "Will we shave off or shorten the hair? He said, "We will shave it off at home. When we returned home, we forgot to have our hair cut and took off the Ihram (clothing worn during the ritual state for Hajj and `Umrah). What is required from us? May Allah reward you with the best! A 3: If a pilgrim forgets to shave or shorten his hair and performs the Tawaf (circumambulation of the Ka`bah) and Sa`y (going between Safa and Marwah during Hajj and `Umrah) but wears his regular clothing before shaving or shortening the hair, it is obligatory on him to take off his clothes when he remembers (Part No. 10; Page No. 207

A 3: If a pilgrim forgets to shave or shorten his hair and performs the Tawaf (circumambulation of the Ka`bah) and Sa`y (going between Safa and Marwah during Hajj and `Umrah) but wears his regular clothing before shaving or shortening the hair, it is obligatory on him to take off his clothes when he remembers (Part No. 10; Page No. 207) and put on the garment of Ihram. Then, he should shave his head or shorten his hair and wear his clothes and nothing is required from him. There is nothing wrong with him because he is excused due to forgetfulness.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.