The standard pillowcase size is 22" pillow by 20" pillowcase, this is not a standard. They will fit a 20" or smaller pillow which seems obvious but that is NOT how pillowcases are made here. They should say that these covers are for a 20" pillow, they should not be advertised as 20" pillowcases as that would imply they will fit a slightly larger pillow which is not the case. These "20" pillowcases are actually smaller than 19" square and due to the "hidden" zipper that only opens about 2/3 open, I think this would be a stretch for 18" pillows, let alone a bigger pillow. Note that they do not fit standard pillow and pillowcase sizes.
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