reflective ironing board cover_table cloth with umbrella hole
Flat Sheet
The flat sheet is the first covering over the fitted sheet. It's the layer that touches the body, providing a hygienic, easy to wash barrier between you and other bed coverings used for warmth and/or decoration. Luxury sheets can hang down the side of the mattress though traditionally they are tucked in all the way around for a more polished presentation.

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). A bottom sheet is laid above the mattress, and may be either a flat sheet or a fitted sheet (a sheet which has been sewn with elastic or a drawstring along the hem of the top, sides and bottom of the sheet to prevent it from slipping off of the mattress). 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.