Mairwen says: “Three-in-one refers to 3 variations on a theme. I made the most basic version (stockinette with ribbing and rolled hems). There are also a seed-and-garter Guernsey and a seed-and-garter tunic. According to the directions, the yarn amounts are the same for all three versions (despite the tunic’s being longer). As usual, your mileage may vary.”