What is "pillowslip"

Usage examples of "pillowslip".

Even that soiled pillowslip with his few possessions was suddenly a burden.

Guards in black returned his filthy pillowslip and let them through clanging doors.

With his blond head cradled on the silk of the pillowslip and the rosebud lips relaxed in sleep, Hubert hardly looked capable of the monstrous acts of which Javan knew him to be guilty.