This pattern is available for free at the website link above.

This extra chunky yarn makes for a very quick knit. This pillow cover can be completed in under 2 hours if you’re a fast knitter.

Pattern contains instructions for pillow covers in the following sizes:
12” x 16” (pictured)
16” x 16”
18” x 18”
20” x 20”
26” x 26”

The pattern is available for free on the At Yarn’s Length website, but you also have the option to purchase an ad-free PDF download.