I am on the run but caught your post so this is what I can offer for info right this minute. Will find more for you later. My question is: did you use a pattern or just try to make the hat on your own? (would love to see the finished hat. I bet it is cute ---and warm--- and your "fix" to make it wearable is probably perfect

) Here is one of several links specifically for hat sizing. There are a number of links that give the general sizing for preemies, toddlers, kids and adults not only for hats but for other clothing as well.
http://crochet-mania.blogspot.com/2008/04/newborn-head-circumference-13-14-hat.html I will, and others will jump in here, too, and be able to give you some general tips on hat making and sizing ---- and patterns, too, if you like...or tips if you choose to make up a pattern of your own.
