The hat I would like to knit requires that I cast on 264 stitches to make a ruffled brim, decreasing down to 66 stitches after the brim is completed. The pattern calls for using 16-inch circular needles. I am having trouble casting on that many stitches on 16-inch circular needles. I'm wondering if I could knit the brim on 24-inch circular needles, and once I've decreased down to 66 stitches, could I begin knitting the next round on 16-inch circular needles? I'm new to knitting in the round and can't picture in my mind what would happen to the "tube" if I changed from one circular needle to another. Any help would be appreciated.