jogging pants shrinking in length

my husband received two pairs of reebok jogging pants for christmas. they were purchased from sears in sarnia ontario. he tried them on they fit him really good so we threw the tags on the pants away. well the first time i washed them they shrank at least 12 inches in lengh. sears informed me there was nothing that could be done about since we didnt  have the original tags on them. i would just like to say what a good product reebok in selling and just how proud our household is to have such a wonderful product available in our stores.  they are in the household known as reebok wash and throw away they really last a long time.  so much for purchasing a supposedly name brand product.  never again.