I believe the finished hat was around 22 inches? I didn’t log the gauge when I wrote this pattern. Let’s see--since the pattern is 90 stitches wide, to achieve 22 inches around, you would want to find the proper needle size to get a gauge of about 4 stitches per inch in stockinette.

Correction!!!: I think I used size 8 US needles when I made a second toddler hat for my nephew and size 10.5 US needles for the original 22 inch version pictured.