Lincoln:
However some kids we knew hung up a pillow case! We thought that was just plain greedy
Similar situation with the custom of Halloween "begging". Some kids use a paper sack or small plastic pumpkin for their candy collection, but a few greedy ones arrive with a pillow case.
(BTW: In California, there has evolved a much more civilized Halloween practice. Parents always accompany their children rather than letting them go wild. Parents carry an empty wine glass that is refilled at some homes. It turns Halloween into a genteel neighborhood event. Everybody wins!)