mattress, and may be either a flat or fitted sheet. A top sheet, in the many countries where they are used, is a flat sheet, which is placed above a bottom sheet and below other bedding.

History

Bed sheets have been used for centuries. The word sheet, meaning length of cloth, is attested by the mid-13th century as a "large square or rectangular piece of linen or cotton spread over a bed" Fitted sheets are a much more recent innovation. In the 1950's African American Bertha Berman filed a patent

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