Abstract: A pillowcase for a king size bed pillow is provided with a releasable fastener, such as a zipper, that extends along adjacent long sides of the fabric layers forming the pillowcase. Since a pair of the short sides of the fabric layers are always open, the layers may be separated along at least two adjacent sides to facilitate insertion and removal of a pillow between the layers. The sides of the layers opposite the open end of the pillowcase may also be secured by a releasable fastener, such as an elongated, L-shaped zipper so that the layers may be separated along three sides and opened like a book to receive a pillow. By employing a releasable fastener along at least one of the long pair of adjacent sides of the pillowcase layers, the task of inserting a pillow into the pillowcase is greatly facilitated.