Thanks for the square-knot instructions!
I don't know much about making the pillowcase dresses because I haven't made any yet, but the link to the instructions above says: "[You'll need] one package of bias binding (you get this in the notions section of the fabric store--look for double fold binding tape)"
Sou I guess we get the double-fold. I don't know what it means either (I haven't really sewed anything since 4-H!), but I saw it at the store.
double fold means that both edges are folded in (the long edges, not the ends). It will have one fold in the center that you'll place over the raw edge of the fabric and then you'll sew along the side that is "hanging" over and there won't be any raw edges b/c each edge is already pre-folded under. make any sense, lol?