Is it Misti Alpaca Chunky? If so......
Here's one but it is not the traditional style hat. The gauge for Misti Alpaca Chunky is Size 10 needles - 3.5 stitches to the inch (108 yds, 100 grams, 2 ply) so it seems that any chunky yarn pattern that has that gauge would work.
Another pointy hat.
Logan's Baby Hat
Here's one for purchase.
Cute Chunky Knit Sweater on this site.
Braided Hat for purchase. Scroll down.
This Knitted Basic Hat Formula pdf file might help you out for figuring out your own pattern.
Head size chart for different size babies is useful information as well.