Once upon a time there was a girl named Stephilocks. (Look, if Goldilocks can be a name, then so can Stephilocks.)
Stephilocks was a determined girl and after reading a book about knitting, decided to knit a fair isle hat for her nephew.
The first hat she knit with Wool Gatto from Lana Gatto.
It was, sadly, too small.
For the second hat, she decided to use the yarn specified in the pattern. She bought Baby Ull (in 2007) and then she cast on 200 stitches. This should have given her a size between the 22" and 23" inches, like the pattern said. But Stephilocks was a foolish girl and decided to knit the fair isle on needles that were .25mm bigger than what the pattern said to use.
Stephilocks knit and knit and knit on the second hat. She ate porridge of questionable temperature, then she knit some more.
She sat in chairs of varying degrees of comfort while she knit and knit and knit.
She slept in a bed that was just her size and then she got up and knit some more.
Then Stephilocks tried on this hat:
Stephilocks then put down her knitting and fixed herself a good, stiff drink.