Question: Make your own pillowcases.
Option 0: Get some material you like and measure your pillow. Make sure you have enough material to cover the top. Sew around all 3 sides and leave one end open. Hem that end. Insert pillow.
Option 1: Get some material you like and measure your pillow. Make sure you have enough material to cover this twice. Sew around all 3 sides and leave one end open. Hem that end. Insert pillow.
Answer: 1