It calls for DK weight yarn, but I just have that in pastels so I used Red Heart Super Saver in a bright green, perfect for St. Patrick's Day. Since I used a thicker yarn, I needed to shorten the length of the cords by 6 sc each.
The crochet part is simple, but making the knot might take a bit of time. The pattern provides a link to her website where she has a picture tutorial to help.
I'm planning on making a few more for my daughter's to wear for St. Patrick's Day and any other time they want to.