A set of bedding generally consists of at least flat or fitted bed sheet that covers the mattress; a flat top sheet; either a blanket, a quilt, or a duvet. Sometimes with a duvet cover is to be used in addition to or instead of the top sheet; and a number of pillows with pillowcases, also referred to as pillow shams.
A bed sheet is a rectangular piece of cloth used either singly or in a pair as bedding, which is larger in length and width than a mattress, and which is placed immediately above a mattress or bed, but below blankets and other bedding (such as comforters and bedspreads).
