Have a pattern that I made for a 3 month old (its a hat). I used US 6 kneedles. I want to make it adult size but I want to use the exact same pattern so I wanted to use bigger kneedles but not sure what size to use. I was thinking US 8. There are 88 sts in the round. I'm going to measure if after a few rows to check but was wondering before I start if this sounds about right?