This headband is not too complicated, I finished it in 3 evenings. The stitch requirements for this pattern are super simple, just cast on, garter stitch, and bind off. However, to get the diagonal stripes, it incorporates a style of rearranging stitches which is difficult until you get the hang of it. You will also need to sew the twist in the headband into place.
One size fits most adults.
You will need US size 6 circular needles, 2 skeins of sport weight yarn in complementary colors, and a tapestry needle.