The Scarlet Sweater is worked from the top down with a line of raised knit stitches down the middle of the front, middle of the back, and along both sides of the body, as well as down the underside of both sleeves. The first section of the back yoke is worked flat, back and forth, while the slope of the shoulders is shaped using short rows. After this, an i-cord edge is worked along the back yoke cast-on edge. The stitches for each of the shoulders are picked up and knitted along this i-cord, and the shoulders are worked separately flat, back and forth. The shoulders are then joined to form the front yoke. The front and back yoke are joined to form the body, which is worked in the round on a circular needle. The sleeves are worked from stitches that are picked up and knitted along the armholes. The neck rib edge is worked at the end, from stitches that are picked up and knitted along the neck opening.
The sweater is knit in DK weight. The pattern recommends 3mm needles but I would suggest you swatch. I would use 3.75mm-4mm with a DK weight yarn to get the tension that PetiteKnit is asking for.