We change our pillow cases twice a week. The sheets are changed once every week or two. So, we need extra pillow cases. Our room is lavender. I look for purple sheets and pillowcases every where I go. Purple, lavender, violet, etc. It's not the easiest colors to find, but they turn up in unexpected places, like the farthest back corner of Reny's. They were twin flat sheets. 400 thread count. I thought, "How easy to make pillowcases out of these!"
I could get four pillowcases out of one twin flat sheet. Now we have plenty of extra pillowcases : )