Is there a ratio of a certain number of stitches to CO for a ruffle if you know how many you want to end up with for the unruffled portion of a hat? For example, you know your hat will be 80 stitches, do you cast on 4 times or 3 times that number and then decrease to get to 80? How many rows is a ruffle on a baby/child hat?
whenever i have done the ruffle hats i have cast on 3 times as many stitches as i want the hat to be and then decreased for two rows. I would suppose it would just depend on HOW ruffly you wan the hat to be.
Probably the only way you could know is to do a practice piece. It doesn’t have to be full size, maybe about 1/4 the size so you can see what it does.
sue