The problem I had in designing this scarf is it needed to be grafted, and grafting in rib is ... difficult. After thinking about it and looking at some online tutorials I realized that grafting in rib is just grafting in stockinette. From both the front and the back.
Thank you to Laura for modeling my scarf at the preschool playground.
Read the directions, make the scarf, and if you have difficulty (or better yet, think of a better way to graft in rib), let me know.
As an aside, this scarf can be made in garter stitch and have no issues with the grafting.
Download here