For each one you need:
9.5" X Width of Fabric (about 42 inches) - for the "cuff"
2.5" X width of fabric - if you want a small contrasting band
27" X width of fabric - for the body
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For 2 pillowcases, you would need:
19" X WOF - for the "cuff"
5" X WOF - if you want a small contrasting band
54" X WOF - for the body
Remember, a yard is 36". Also, remember if you are purchasing fabric, allow a couple extra inches for straightening the fabric if it isn't cut straight.
Hope this helps.