I was glad to read that I'm not the only one who hates it when guests sleep on pillow shams. Don't people know they are for decoration?
Perhaps it's easier to make the distinction between pillow case and pillow sham (which goes over the pillow case) when dealing with a Euro sham. These square covers, which often come with fancy bedding sets, are designed to fit the large Euro pillows that many people layer behind standard pillows to create added decoration and cushion. Euro shams typically measure 26-by-26-inches square.
Are you a Euro sham fan? Or do you think less is more in the pillow department?