I have yardage requirements posted here: www.diapershop.com/yardage.htm - that ought to help you know what all you'll need. You can subsitute the birdseye for hemp if you'd like ... or diaper flannel, whatever your preference.
I use 1/4" on all sizes ;o)
HTH!
I use 1/4" on all sizes ;o)
HTH!