This set is so beautiful and so easy to make. I used Red Heart Ombre for the matching hat and cowl, but any #4 worsted weight yarn should work. The single hat was made with I Love This Yarn and works up just as easily. Please note if using I Love This Yarn, you will need 2 skeins. I used an I, 5.5mm US hook. Gauge is important for the hat, but not for the cowl. This is an amazing combo, I hope you enjoy making it as much as I did.