The Common Sense review summarizes much of the good stuff abt this book but I wanted to add one more thing - Lisa, the girl who takes Corduroy home, is not white (it looks like she's black or hispanic). It's hard to find good books with minority main characters and this one is so readily available at libraries everywhere.
I had this book as a child, and loved it. I was 7 in 1968 when it first came out and it meant a lot to me because it was the first book I owned that had a Black girl as the protagonist...someone who looked like me! As a mother, I purchased the book for my daughter who is now 26 and a mom herself. It's a good book for anyone regardless of age or race, very warmhearted and inspiring because we all at one point had a toy we fell in love with and loved despite it's alleged 'imperfections.'
Corduroy is an excellent story. Probably one of the best children's books in general. Talks about the importance of home, friendship, and love. All the while providing an exciting story about a teddy bear looking for one small button in a giant department store. I would recommend this book to anyone with children.