stockinette beanie brim question
So I want to make a couple of beanies for my boys, like the one I seem to see every man and boy wearing these days. But the ones I see (non-handmade) all seem to be completely stockinette stitch. I know that's not possible for handmade because the brim will roll. I like roll brim hats, but that's not what I'm after with these beanies.
I know I can do a ribbing, a garter brim, or a seed stitch. I'm currently planning a 1x1 rib. But I'm just wondering: how on earth do the non-handmade ones not need a non-stockinette brim? Is there some way to hem them to keep them from rolling? I'd be up for hemming if it meant I could do the whole cap in stockinette....