ok if i wanted to make a double waist band on my shorties i have already finished.
What would be the best way to do this?
cast back on to one side and k2p2 the same length and blanket stitch on - repeat on the other side?

Or cast on 50 (this is the width of my shorties waist) k2p1 and then attach on the inside of the wasit somehow?

Dont have circular needles so cant do it in the round and i doubt i will be able to fit 100 stitches on my needles to do all at once??

suggestions?