The white handkerchief, coming with the waxed seal, documenting its authenticity, belonged to Pope Pius XI.
All clothing items belonging to popes come with stories of how they were gotten. While we are not sure of the origin of this item—how it got into the hands of the original collector– it is probably the result of a papal employee taking it as a memento of the Holy Father. At any rate, it is a wonderful addition to this Collection.