Why does Ted return the powwow dance outfit?

Ted gives a speech about how he bought a beautiful beaded powwow dance outfit from a swindler years ago, but felt guilty about purchasing in such a shady manner. Therefore, he spent thousands of dollars to find out who the gown belonged to, and his search led him to a Spokane woman named Grandmother Spirit. After struggling with the decision of whether or not to return the gown, he eventually decided to bring it back to its rightful owner.