Embroidered Pillowcases With Green Pair

Butterflies float above a field of flowers on these embroidered pillowcases.  A green and yellow tatted border scallops the edge and measures 1/2″.  Probably cotton but unsure, the fabric is starched and shows lots of care.  They both measure 21 X 29 and would fit a standard pillow.  There is normal yellowing to the fabric but no visible stains.