Originally Posted by Jennifer23

One piece of advice I got from an interior designer: she always buys pillow forms 2" or so larger than the pillowcase. This makes the pillow look fuller, and look good longer even if the pillow is getting hard use. I even have a 10x16" pillow, made by folding a square pillow form in half! Pillow forms are very forgiving, so your case size doesn't have to be as exact as you're trying to make it.