I made my pillowcases 26 1/2 inches long by 21 inches wide(for ea side) using a 5 1/2 in border and 1 inch folded trim, using 45 inch wide material. Since there are different sized pillows I would measure the pillow it is going on first(or have it measured) in order to get the right size. If you need two pillow cases, then it would take 2 1/3 yards to make 1 pair of pillowcases(this depends on the width of the pillow).